... polarity Embryonic axis Symmetry breaking Embryonic regulation Regeneration Summary: Two adjacent extra-embryonic tissues, the area opaca and the marginal zone, interact to influence the polarity of the early chick embryo. © 2022. Published by The Company of Biologists Ltd 2022...

... expands at the expense of mesoderm; the anterior-posterior axis is positioned more distally and an ectopic posterior-like domain appears anteriorly, suggesting a role for Oct4 in maintaining the embryonic axis. Although primitive streak forms in the presumptive proximal-posterior region, epithelial...

... that the D quadrant acts as the organizer of the embryonic axes in annelids, although this has never been demonstrated directly. Here we show that D quadrant micromeres (2d and 4d) of the oligochaete annelid Tubifex tubifex are essential for embryonic axis formation. When 2d and 4d were ablated the embryo...

... Amphioxus Spemann organizer Embryonic axis Urbilateria Size scaling Evolution The evolution of animals, and specifically the relationships and lineages between extinct and extant species, is a central problem in biology ( Fig. 1 ). Related to it is a key question of evolutionary developmental...

... the primary embryonic axis (arrow, Fig. 2B ), although this may reflect increased tissue mass along the axis. During early somitogenesis (bud stage; Fig. 2C ), β4GalT5 was expressed uniformly throughout the embryo, including expression in the polster. Later in somitogenesis (12 somites, Fig. 2D...

... for correspondence (e-mail: dmcclay@duke.edu ) 12 10 2005 © 2006. 2006 p38 Embryonic axis Nodal Gsc Axis specification and patterning is a foundational developmental process,during which the hierarchical specification of increasingly smaller and more specialized territories...

...Federica Bertocchini; Isaac Skromne; Lewis Wolpert; Claudio D. Stern Avian embryos have a remarkable capacity to regulate: when a pre-primitive streak stage embryo is cut into fragments, each fragment can spontaneously initiate formation of a complete embryonic axis. We investigate the signalling...

... of Biologists 2001 Hindbrain Mauthner neuron Homeosis Embryonic axis Hoxb1b Meis3 Pbx4 Zebrafish Vertebrate hox genes, like their Drosophila counterparts the HOM-C genes, play essential roles during embryogenesis. For instance, their expression in overlapping domains along...

... implicated in patterning the main embryonic axis only in vertebrates. Sea urchins belong to a phylum which diverged shortly after the protostome-deuterostome separation. Our finding that GSK3β is an essential element in patterning the main axis of the sea urchin embryo suggests that the Wnt pathway...

.... * Author for correspondence at address 2 23 07 1996 © 1996 by Company of Biologists 1996 Siamois noggin goosecoid chordin brachyury Xwnt-8 Xnr-3 Xenopus dorsalisation embryonic axis Spemann organiser Nieuwkoop centre late blastula organiser Wnt signalling neural...

... Strasbourg, France ‡ Dept. of Molecular Biology, Princeton University, Princeton, NJ 08544 11 9 1995 © 1995 by Company of Biologists 1995 notochord gastrulation embryonic axis mesoderm zebrafish floating head Commitment of cells to a particular pathway...

... and dis-persal of plaques of accumulated organelles around supernumerary sperm nuclei, and a series of surface movements. Their timing and direction of propagation suggest they may be involved in establishing cytoplas-mic differences with respect to the embryonic axis. Inhibitor experiments suggested...

...Claudio D. Stern; Yohko Hatada; Mark A. J. Selleck; Kate G. Storey ABSTRACT The hypoblast is generally thought to be responsible for inducing the mesoderm in the chick embryo because the primitive streak, and subsequently the embryonic axis, form according to the orientation of the hypoblast...

... of zygotic pattern genes. Copyright © 1991 by Company of Biologists 1991 Drosophila embryo embryonic axis zygotic target genes zygotic pattern genes In the life cycle of higher animals, complex forms alternate with simple ones. An individual begins its life as a zygote (a fertilized...

... of scattering activity ( Table 1 ) and retested at the same time as they were grafted. scatter factor epithelial-mesenchymal interactions primitive streak mesoderm neural induction embryonic axis motility factors Scatter factor is a recently discovered protein, of M r 62 ×10 3 , which...

... , epiblast; ps , groove of primitive streak. 15 09 1988 © 1988 by Company of Biologists 1988 gastrulation primitive streak induction mesoderm hypoblast chick embryo morphogenesis HNK-1 antibody glycoconjugates embryonic axis The process of gastrulation results...