... the basement membrane to invade between germ cells. We define a timeline of reproducible milestones, using time-lapse imaging of egg chamber explants. Inward migration occurs in two phases. First, leading centripetal FCs ingress, extending apically over the anterior oocyte, and constricting basally. Second...

... layer. Nodal signaling Ingression Endoderm Germ layer segregation Zebrafish gastrulation Genentech 10.13039/100004328 National Institutes of Health 10.13039/100000002 DK092312 DK106358 GM118167 American Heart Association 10.13039/100000968...

...Shu-Yu Wu; David R. McClay In metazoans, the epithelial-mesenchymal transition (EMT) is a crucial process for placing the mesoderm beneath the ectoderm. Primary mesenchyme cells (PMCs) at the vegetal pole of the sea urchin embryo ingress into the floor of the blastocoele from the blastula...

.... At the blastula stage, the 32 cells of this lineage detach from the epithelium and ingress into the blastocoel by a process of epithelial-mesenchymal transition. We report that shortly before ingression,there is a transient and highly localized activation of the MAP-kinase ERK in the micromere lineage. We show...

... in apicobasal asymmetries associated with gastrulation. Ectopic separations appeared between lateral surfaces of cells that are normally tightly adherent, cells that ingress during gastrulation failed to accumulate nonmuscle myosin at their apical surfaces and ingression was slowed. Thus, PAR proteins function...

... mainly from the rostral half of the primitive streak, and that endodermal movements parallel those of ingressing adjacent mesodermal subdivisions. Second, the question of the epiblast origin of the endodermal layer was addressed by precisely labeling epiblast cells in a region known to give rise...

...Jeremy Nance; James R. Priess Gastrulation in C. elegans embryos involves formation of a blastocoel and the ingression of surface cells into the blastocoel. Mutations in the par-3 gene cause abnormal separations between embryonic cells, suggesting that the PAR-3 protein has a role in blastocoel...

... tracers have shown that, in C. ornata , some prospective noto-chord, somite and tailbud mesoderm cells leave the sur-face epithelium of the archenteron by ingression. After gastrulation, SEM reveals cells with constricted apices and a bottle shape in three zones on the archenteron roof and in a fourth...

... is initially most evident near the egg’s equator or marginal zone, extensive rearrangements associated with cleavage furrowing (cytoplasmic ingression) relocate portions of the swirl to vegetal blastomeres on the prospective dorsal side. * Corresponding author 14 12 1990 © 1991 by Company...

... cell layers thick. As gastrulation proceeds, the superficial and deep layers move over the blastoporal lip in concert, so that as cells leave the surface, they join an already significant population of mesenchymal cells. cell lineage tracing gastrulation ingression superficial cells...