1 re ischemia reperfusion injury (genetic cell
fate mapping).
2 Tribolium embryos with wild-type and altered
fate maps.
3 cing for antibody lineage tracing and B cell
fate mapping.
4 he epicardium, epicardial-derived cells, and
fate mapping.
5 the nonsensory-to-sensory switch observed by
fate mapping.
6 cribe how this can be achieved using in situ
fate mapping.
7 et of resident macrophages in the absence of
fate mapping.
8 gesting that Sox2-CreER may not be useful to
fate map a supporting cell origin of regenerated hair ce
9 itional, inducible transgenic mouse model to
fate map adult-generated DGCs.
10 ng injury and an SPC-driven inducible cre to
fate-map AECs, we found the majority of type II AECs in
11 Our mRNA expression and
fate mapping analyses demonstrate that the dorsolateral
12 Morphologic and
fate-mapping analyses in our study revealed that, in the
13 Mouse genetic
fate-mapping analyses show that embryonically, a c-Kit(+
14 Fate mapping analysis showed that IL-17-expressing exFox
15 electroencephalography/video-monitoring, and
fate mapping analysis.
16 Single-cell and
fate-mapping analysis both suggested that there is a uni
17 Genetic
fate-mapping analysis confirms that the newly formed myo
18 cell formation at postnatal day (P) 0/P1 and
fate-mapping analysis revealed that in the absence of Ja
19 Fate-mapping analysis revealed that, although ductal ste
20 Here, we combine macrophage
fate-mapping analysis with single-cell RNA sequencing to
21 ltiple genetically engineered mice to track,
fate map and ablate cells to determine the source and fu
22 Taken together, our
fate map and recording of cell migrations provides a fir
23 Using transgenic mice to
fate map and to selectively kill SVZ-derived eNPCs in th
24 We used
fate mapping and AID(GFP) reporter mice to determine if
25 Fate mapping and chimera studies, however, failed to pro
26 Genetic
fate mapping and clonal analysis of individual cells rev
27 Eight weeks post MI,
fate mapping and flow cytometry revealed that a 2.9-fold
28 Using in vivo
fate mapping and flow cytometry, we estimated that durin
29 ination of in vitro explant culture, genetic
fate mapping and gene overexpression and knockdown to ex
30 Cell-
fate mapping and gene-deletion studies using zG-specific
31 Current
fate mapping and imaging platforms are limited in their
32 Using in vivo genetic
fate mapping and in vitro clonal analysis, we identified
33 Concurrent
fate mapping and labeling with mitotic tracers showed th
34 Here, we broadly review the origins of
fate mapping and lineage tracing approaches.
35 Using photoconversion-based
fate mapping and live cell tracking coupled with laser a
36 explore the source of tendon progenitors by
fate mapping and live imaging, as well as underlying mol
37 these unresolved questions, with emphasis on
fate mapping and modeling of the hematopoietic flow from
38 Using
fate mapping and mutant analysis, we find that PAA proge
39 re, by combining multicolour 'Brainbow' cell-
fate mapping and sequencing of immunoglobulin genes from
40 targets for disease therapy, we combined SMC
fate mapping and single-cell RNA sequencing of both mous
41 Combining single-cell
fate mapping and three-dimensional cell tracking in the
42 w technologies to synthesize high-resolution
fate maps and discuss their potential for interrogating
43 ls and their progeny in vivo, we generated a
fate-map and reporter of GM-CSF expression mouse strain
44 rain circuits using a combination of genetic
fate-mapping and assays in mice.
45 In both the undamaged and damaged utricle,
fate-mapping and electrophysiology experiments showed th
46 Two recent studies use
fate-mapping and limiting dilution transplantation assay
47 Fate-mapping and lineage-analysis studies have revealed
48 Using
fate-mapping and methods to bypass the lung or intestina
49 -dimensional cytometry, bulk RNA-sequencing,
fate-mapping and microscopy, we reveal the diversity of
50 We used
fate-mapping and other methods to demonstrate that utric
51 Fate-mapping and single-cell RNA sequencing studies also
52 By combining genetic
fate-mapping and single-cell transcriptomics, a new stud
53 Il17a
fate-mapping and transcriptional profiling provide evide
54 tes to the atrium in zebrafish by multicolor
fate-mapping and we compare our analysis to the establis
55 anner predicted from classical developmental
fate mapping,
and differentiate into each of the three p
56 lizing a combination of genetics, retroviral
fate mapping,
and lineage-specific retroviral barcode la
57 er into RAG2/cgamma-chain(-/-) mice, NK cell
fate mapping,
and RAG1(-/-) mice vaccine-challenge exper
58 RISM, a progenitor-restricted intersectional
fate mapping approach in which Flp recombinase expressio
59 We used a SC
fate-mapping approach to examine the contribution of reg
60 We used an inducible, Cre-loxP in vivo
fate-mapping approach to examine the contributions of th
61 Using a novel
fate-mapping approach, we demonstrate that precursors in
62 Here, we addressed this issue using a Treg
fate-mapping approach, which revealed that Treg loss was
63 Using complementary
fate-mapping approaches and reporters for ILC2 activatio
64 METHODS AND Using 2 in vivo
fate-mapping approaches combined with a smooth muscle ce
65 Using 2 in vivo
fate-mapping approaches combined with a smooth muscle ce
66 Here we use
fate-mapping approaches in conjunction with three-dimens
67 However, using parabiosis and
fate-mapping approaches in mice, we found that CNS macro
68 ave investigated this question using genetic
fate-mapping approaches in mice.
69 we use loss-of-function, label-retention and
fate-mapping approaches in the little skate to demonstra
70 Using high-resolution genetic
fate-mapping approaches with cKit(CreERT2/+) and Wnt1::F
71 Using parabiosis and
fate-mapping approaches, we confirmed that monocytes do
72 Using multiple
fate-mapping approaches, we show that arterial macrophag
73 Using murine models of atherosclerosis and
fate-mapping approaches, we show that hematopoietic stem
74 Nestin
fate-mapped astrocytes also flow anteriorly from the SVZ
75 Fate mapping at multiple time points in combination with
76 Fate mapping at the open neural plate stage was carried
77 ay toward construction of retrospective cell-
fate maps based on mutations accumulating in genomes of
78 cing systems are not suitable for epicardial
fate mapping because of endogenous endothelial expressio
79 Combining genetic
fate-mapping,
birth-dating, and gene expression studies,
80 ing cardiomyocytes, and suggest that hypoxia
fate mapping can be a powerful tool for identifying cycl
81 rneolimbal epithelium, then spatiotemporally
fate-mapping cell behavior during healing.
82 We show here by
fate mapping,
clonal analysis, and immunohistochemistry
83 To this end, we established multicongenic
fate mapping combined with mathematical modeling to quan
84 Fate mapping confirmed that in the course of mesial temp
85 Inducible genetic
fate mapping confirmed that new bone cells do not arise
86 Inducible genetic
fate mapping conveniently allows for the labeling of EBG
87 These nestin
fate-mapped corpus callosum astrocytes are uniformly pos
88 x3(Cre/+) and Hoxb1(Cre/+) mice to label and
fate map cranial NEC lineages, we have demonstrated that
89 In contrast to murine
fate-mapping data, which indicate that only ILC3s expres
90 Time-lapse imaging and
fate mapping demonstrate that the dorsal habenulae (dHb)
91 Genetic
fate mapping demonstrated that cMPhi derived from CX3CR1
92 Inducible
fate mapping demonstrates that BMI1 is expressed in vivo
93 C regeneration, we used three CreER lines to
fate-map distinct groups of SCs during regeneration.
94 The
fate mapped E11.5-12.5 STN neuronal population included
95 Fate-mapping either alone or combined with a mitotic tra
96 lpha IEL ontogeny, we performed "time-stamp"
fate mapping experiments and observed that it seeds the
97 Fate mapping experiments revealed a contribution of the
98 However, genetic
fate mapping experiments suggest that mesenchyme-derived
99 Fate-mapping experiments demonstrated that neighboring s
100 Our
fate-mapping experiments identify, in the fetal liver, a
101 Moreover,
fate-mapping experiments revealed that the timing of SOX
102 was distal from the DC lineage, as shown by
fate-mapping experiments using Zbtb46.
103 e of these cells has not been proven through
fate-mapping experiments.
104 Moreover, dSPNs, as marked by Isl1-cre
fate map,
express Sox8 in the embryonic striatum and Sox
105 gastruloids to piece together a rudimentary
fate map for the human primitive streak (PS).
106 ee legs differ in their morphology, only the
fate map for the T1 (prothoracic) leg disc has been gene
107 Here we present
fate maps for the T2 (meso-) and T3 (metathoracic) leg d
108 olving lineage tracer to assemble mouse cell-
fate maps from fertilization through gastrulation.
109 aexpression patterns, PP are comparable to a
fate map generated experimentally by laser ablation and
110 f adult MbDA neurons using genetic inducible
fate mapping (
GIFM).
111 hip between monocyte subsets was verified by
fate mapping grafted human classical monocytes into huma
112 Fate mapping has shown that mature tissues such as blood
113 Fate mapping,
however, reveals that intermediate cells r
114 We demonstrate the ability of the system to
fate-map hypoxic cells in 2D, and in 3D spheroids and or
115 In this work, we present an approach to
fate-map hypoxic cells in vivo in order to determine the
116 aneously beating myocytes in vitro; cre/LoxP
fate mapping identified a noncardiac population of (c-ki
117 Using genetic
fate mapping in mice, we show that in the absence of Ptf
118 Clonal
fate mapping in vivo reveals heterogeneity in Ascl1-expr
119 t permit both prospective identification and
fate mapping in vivo.
120 ification of IL-22-producing cells and their
fate mapping in vivo.
121 c changes and establishing cell lineages and
fate maps in vivo.
122 dney cells expressing renin were genetically
fate-mapped in adult Ren1cCreERxRs-tdTomato-R, Ren1cCrex
123 deficient mutants in zebrafish, and physical
fate-mapping in frog and lamprey, we find that NECs are
124 Using genetic
fate-mapping in the mouse, we found that the epithelial
125 in mice from Wnt1Cre and Atoh1 CreER lineage
fate mapping,
in common with the major precerebellar nuc
126 Genetic
fate mapping indicated that the majority of cardiomyocyt
127 A-based strains, SMA-Cre(ERT2) and SMA-rtTA,
fate mapped into the majority of cold-induced beige adip
128 nitors are also highly labeled when Flt3-Cre
fate mapping is applied.
129 roposterior (AP) origin of the IP complex by
fate-mapping its neuromeric origin in the chick, discove
130 We show here, using gene expression and
fate mapping/
lineage tracing in zebrafish, that pineal p
131 In vivo
fate mapping made clear that melanoma cells undergo a co
132 Common single-cell phylogenetic
fate mapping methods have utilized highly mutable micros
133 Using NFIL3-deficient mice, PLZF reporter/
fate mapping mice, and mixed bone marrow chimeras, we id
134 meric animals and Foxp3-GFP/ERT2-Cre/dTomato
fate-mapping mice show that TLR-initiated DC autocrine C
135 In this study,
fate-mapping mice were used to assess the stability of T
136 ed in culture with CD4(+) T cells from Il17a
fate-mapping mice, were adoptively transferred to assess
137 Using a genetic
fate-mapping model that allows us to trace the progeny o
138 Using
fate-mapping models and monocytopenic mice, together wit
139 To investigate this, we performed targeted
fate-mapping,
molecular characterisation and cell cycle
140 Recently, using a bi-transgenic ACM
fate mapping mouse model and an in vitro culture system,
141 Using a novel
fate-mapping mouse model, we trace the developmental ori
142 Here we used two new
fate-mapping mouse models to track Th17 cells during imm
143 (s) of hair cells are formed postnatally, we
fate-mapped neonatal supporting cells by injecting Plp-C
144 Here we combine intersectional
fate mapping,
neuron sorting, and genome-wide RNA-seq to
145 ux2 expression pattern, the vast majority of
fate-mapped neurons express Satb2 but not Ctip2, confirm
146 des the first overview of the spatiotemporal
fate map of Neurog1 lineages in the CNS.
147 ryos exist for nearly all model organisms, a
fate map of the gastrulating human embryo remains elusiv
148 ysis of these gastruloids, together with the
fate map of the mouse embryo, allows the organization of
149 e tools to generate a comprehensive regional
fate map of the mouse subpallium, including sources for
150 llowed us to define a comprehensive regional
fate map of the pallium.
151 Utilizing the published
fate map of the spiral-cleaving annelid Capitella teleta
152 NMR-based quantitative
fate mapping of (13)C-labeled substrates revealed that l
153 We performed in vivo
fate mapping of adult hair follicle dermal sheath (DS) c
154 provide comprehensive temporally controlled
fate mapping of an innate lymphocyte subset with notable
155 of individual memory lymphocytes by in vivo
fate mapping of CD8(+) T cells and their descendants acr
156 Fate mapping of chick tailbud further revealed that spre
157 These studies provide an in vivo model for
fate mapping of DCs, distinguishing them from other leuk
158 Here we report
fate mapping of hypoxic cells and their progenies by gen
159 iated gene manipulation in microglia and for
fate mapping of microglia but not CAMs.
160 Fate mapping of nestin(+) cells unambiguously revealed t
161 stigations in quail-chick chimeras involving
fate mapping of neural crest cells to the ultimobranchia
162 Fate mapping of neural crest-derived tissues indicates t
163 rough systematic targeting of cell types and
fate mapping of neural progenitors.
164 NG2 cell fate determination, we used genetic
fate mapping of NG2 cells in constitutive and tamoxifen-
165 dicates four phases of gene expression while
fate mapping of progenitor cells suggests that OHCs and
166 nic transcription factor drivers allow finer
fate mapping of progenitor pools that give rise to disti
167 egeneration in the postnatal cochlea rely on
fate mapping of supporting cells.
168 However,
fate mapping of these cycling cardiomyocytes has not bee
169 lopment and traced their history to generate
fate maps of CD8(+) T cells produced during different st
170 Fate maps of different discs have been generated that sh
171 Although
fate maps of early embryos exist for nearly all model or
172 are able to track cell lineages, to generate
fate maps of the blastema and to identify the progenitor
173 Genetic
fate-mapping of Alpi(+) cells before or during targeted
174 ion and gut vascular development we combined
fate-mapping of ENCC with immunolabelling and intravascu
175 using an in utero MF-depletion strategy and
fate-mapping of yolk sac (YS) and fetal liver (FL) hemat
176 a functional analysis, using CRISPR/Cas9 and
fate mapping,
of 5' hox genes and enhancers in zebrafish
177 Lineage tracing and
fate mapping,
overlapping yet distinct disciplines to fo
178 Here we used
fate mapping,
parabiosis and single-cell transcriptomics
179 We utilized a combination of genetic
fate mapping,
parabiotic, transcriptional, and functiona
180 ssessed the cellular origin of new myelin by
fate mapping platelet-derived growth factor receptor alp
181 However, when normalized to the total
fate-mapped population, pillar, Deiters', inner phalange
182 Although intestinal Rorc
fate map-
positive (Rorc(fm+)) ILCs show a clear ILC3 phe
183 However,
fate maps provide spatial information, often lost in lin
184 urrently in use by several investigators for
fate mapping purposes, and may be adopted by others in t
185 Ventricular contractile function and the VCS
fate map remained unchanged in VCS-specific Tbx5 knockou
186 Analysis with Treg
fate-mapping reporter mice further demonstrates that IL-
187 onent of the exocrine pancreas; however, our
fate-mapping results indicate that CACs are more closely
188 Our genetic
fate-mapping results show that Isl1-expressing progenito
189 on including expression of NEUROG1, although
fate-mapping results suggest SOX2 may be required as a c
190 ng regions of the orofacial prominences that
fate mapping revealed contribute to the upper lip and pr
191 Fate mapping revealed that a fraction of Treg cells lost
192 Furthermore, long-term genetic
fate mapping revealed that TrkB deletion severely compro
193 Genetic
fate mapping revealed that yolk-sac and fetal monocyte p
194 However, Cre-lox-based genetic
fate-mapping revealed a small subpopulation of myenteric
195 SOX2
fate mapping reveals an apical-to-basal gradient of SOX2
196 Fate mapping reveals that >90% of adult oligodendrocytes
197 In contrast,
fate maps,
schematics showing which parts of the embryo
198 Fate maps show that polarizing region and adjacent cells
199 Immunostaining and endothelial
fate mapping showed a robust increase in TGFbeta signali
200 Fate-mapping showed that LepR(+) cells arose postnatally
201 Here, we performed genetic
fate mapping,
showing that VGLUT3 lineage sensory neuron
202 Cre-Lox
fate mapping shows this region gives rise to inner hair
203 Integration of cell-specific
fate mapping,
single-cell genomics, and human genetics a
204 e and describe animal models to identify and
fate-map stem and progenitor cells expressing each Notch
205 of fluorescent reporter transgenes, genetic
fate-mapping strategies and a ventricle-specific genetic
206 Here, we used in mice a cell
fate mapping strategy based on reporter protein expressi
207 is proposal by using a genetic knock-in cell
fate mapping strategy in different murine SCI models.
208 Prior reports that used a reporter gene
fate-mapping strategy are limited in their ability to in
209 We developed an in vivo
fate-mapping strategy that enabled us to follow OSN matu
210 Using genetic mouse models and a
fate-mapping strategy, we determined that vascular peric
211 pporting cells demonstrating its utility for
fate mapping studies beyond this age.
212 Recent genetic
fate mapping studies demonstrated that recovery from AKI
213 oughout development, consistent with genetic
fate mapping studies demonstrating that Rax+ lineages gi
214 Fate mapping studies following transient expression of P
215 Genetic inducible
fate mapping studies have identified two principal epith
216 ne fetal and adult hematopoiesis, while cell-
fate mapping studies have revealed complex developmental
217 We identified Ebf2, through
fate mapping studies, as a novel marker for cortical hem
218 Based on our Genetic Inducible
Fate Mapping studies, we propose a model where SHH signa
219 Recent
fate-mapping studies and gene-expression profiles sugges
220 Recent
fate-mapping studies concluded that EMT is not required
221 New genetic
fate-mapping studies have identified pericytes and the c
222 Recent
fate-mapping studies in mice have provided substantial e
223 Fate-mapping studies of neonatal peptidyl arginine deimi
224 o colonic regeneration by performing genetic
fate-mapping studies of progenitor populations in mice.
225 Fate-mapping studies of the Sox9(+) domain revealed endo
226 Furthermore, clonal analysis in NSC
fate-mapping studies revealed a previously unknown role
227 Genetic
fate-mapping studies suggest minimal contribution; howev
228 Classic
fate-mapping studies suggested that pineal progenitors o
229 ope has been subdued recently by a series of
fate-mapping studies that cast NG2-glia as dedicated oli
230 Whilst recent genetic
fate-mapping studies using lineage-specific promoters ha
231 In
fate-mapping studies, FITC-labeled vertebra periosteal c
232 Using high-resolution genetic analyses and
fate-mapping studies, three main mononuclear phagocyte l
233 deposition during fibrosis based largely on
fate-mapping studies.
234 s by undertaking the first long-term in vivo
fate-mapping study in any cartilaginous fish.
235 A
fate-mapping study revealed that Tsc1-null Tregs that lo
236 cial to the morphogenesis of the head, which
fate maps suggest arises primarily from the disc proper,
237 populated T(H)1 and T(FH) trajectories, and
fate-mapping suggested that there was minimal lineage pl
238 d 4 was recently given support by short-term
fate maps,
suggesting that the chick wing polarizing reg
239 This Chat(Cre)
fate map suggests transient developmental expression of
240 First, we
fate mapped SVZ-eNPCs in cuprizone-induced demyelination
241 ere, we present a new multicolor fluorescent
fate mapping system and quantification approach to inves
242 e we establish a new multicolor fluorescence
fate mapping system to monitor microglial dynamics durin
243 Here, we generated a genetic
fate-mapping system for temporally seamless tracing of t
244 demonstrate the general utility of our novel
fate-mapping system to follow cell population dynamics i
245 We used an intersectional
fate-mapping system using the RC::FrePe allele, which re
246 Herein, we used various multicolor
fate mapping systems to investigate the ontogeny and dyn
247 Combined with lineage-specific
fate mapping systems, our knockout results document an u
248 Using multiple
fate-mapping systems, we show that snMacs do not derive
249 erimental validation reveal heterogeneity in
fate-mapped T(H)17 cells, and a developmental arrest in
250 Genetic
fate mapping tagged 41.4+/-4.1% of the cardiac adipocyte
251 In contrast to previously
fate-mapped Tbx18/WT-1-expressing cells that give rise t
252 Here we use a novel genetic
fate mapping technique to simultaneously track multiple
253 Here, using genetic
fate map techniques, we demonstrate that cardiac fibrobl
254 The combination of inducible genetic
fate mapping techniques with in vitro targeted patch-cla
255 ere, we describe recent discoveries based on
fate-mapping techniques that support the existence of pr
256 Using
fate-mapping techniques, we demonstrate that the princip
257 Here, we show by inducible genetic
fate mapping that type I collagen-producing submesotheli
258 Paradoxically, we demonstrate via
fate mapping that, initially, SOX2 primarily marks nonse
259 We present vital dye
fate maps that suggest the somatopleure is eliminated in
260 Here we show, using clonal genetic
fate mapping,
that Mesp1+ cells in gastrulating mesoderm
261 tor homolog of Blimp-1 in T cells (Hobit) to
fate map the T(RM) progeny in secondary responses.
262 We have
fate mapped the dental mesenchyme, using in vitro tissue
263 Fate-mapping the headfold-stage (~7.75-8.0 dpc) posterio
264 en studied by marker expression analysis and
fate-mapping,
the mechanisms that control the progressio
265 rogenitors and intermediate progenitors, and
fate-mapped their respective neuronal progeny following
266 We
fate-map this mesoderm in the axolotl (Ambystoma mexican
267 In vivo
fate mapping through T-cell receptor sequencing allowed
268 e next employed inducible lineage tracing to
fate map,
through Cre recombinase-mediated fluorescent r
269 gene expression in pallial protodomains that
fate map to distinct cortical regions.
270 We used in vivo genetic
fate mapping to assess the behavior of each progenitor t
271 Here, we used genetic
fate mapping to chart the embryological origins of the t
272 Here, we apply large-scale quantitative
fate mapping to define the patterns of cell fate behavio
273 Here, we utilize in vivo genetic
fate mapping to demonstrate that Fezf2-expressing radial
274 Here, we use genetic
fate mapping to demonstrate that spontaneous myelin repa
275 We now report on using Cre-based
fate mapping to indelibly label pancreatic Notch-respons
276 Using Genetic Inducible
Fate Mapping to mark adult Gli1- or Smooth muscle actin-
277 Using genetic inducible
fate mapping to mark the Sonic hedgehog (Shh) and Gli1 l
278 Finally, we apply our cell-
fate maps to estimate the number of embryonic progenitor
279 ed, hindered by a dearth of genetic tools to
fate map,
track and manipulate beige progenitors and 'be
280 We show by genetic inducible
fate mapping using a Gbx2(CreER) knock-in mouse line tha
281 Fate mapping using BrdU pulse-chase experiments revealed
282 hese topics are reviewed through the lens of
fate mapping using genetically engineered mouse models a
283 We perform long-term
fate mapping using GFP-transgenic axolotl and Xenopus la
284 nducted Ascl1- and Ngn2-inducible expression
fate mapping using the CreER/LoxP system.
285 Here, using intersectional genetic
fate mapping,
we demonstrate that cholinergic fibers wit
286 ilizing simultaneous dual and intersectional
fate mapping,
we demonstrate that this boundary is preci
287 Using genetic
fate mapping,
we found that median eminence tanycytes ge
288 Using conditional genetics and
fate mapping,
we show that Notch signaling is essential
289 Kaede protein as well as Cre-driven genetic
fate mapping,
we show that osteoblasts migrate to the si
290 Using inducible genetic
fate mapping,
we show that the individual involvement of
291 Here, by using genetic
fate-mapping,
we demonstrate that new corpus callosum as
292 us-specific Treg cells combined with genetic
fate-mapping,
we noted that a majority of the Treg cells
293 Here we demonstrate the use of
fate mapping wherein microglia and monocyte-derived cell
294 , we generate retina, RPE and lens subdomain
fate maps,
which reveal novel adjacencies that might det
295 g system that combines Cre/lox-assisted cell
fate mapping with a thymidine kinase (sr39tk) reporter g
296 Genetic
fate mapping with an inducible Casz1 allele demonstrates
297 Here, we combined genetic
fate mapping with highly efficient podocyte isolation pr
298 hly mitotic and short-lived in vivo based on
fate-mapping with Ascl1(CreERT2) and Dlx1(CreERT2).
299 Using genetic
fate-mapping with Cux2-Cre and Cux2-CreERT2 mice we demo
300 wo different pulse-chase approaches--genetic
fate-mapping with stable isotope labelling, and multi-is