... attributed. Summary: Two adjacent extra-embryonic tissues, the area opaca and the marginal zone, interact to influence the polarity of the early chick embryo. Gastrulation Embryo polarity Embryonic axis Symmetry breaking Embryonic regulation Regeneration Wellcome Trust http...

... 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...

... and Mangold (Spemann and Mangold, 1924). Table 1. Wnt/β-catenin and BMP signaling in anteroposterior (AP) and dorsoventral (DV) axis formation Fig. 3. Evolutionary conservation of double-gradient axial patterning in Bilateria. ( A ) Double-gradient model of embryonic axis formation...

... to endogenous proteoglycans can modulate the specificity of cytokine signaling. * Author for correspondence (e-mail: [email protected] ) 28 3 2006 © 2006. 2006 Galactosyltransferase Bmp Zebrafish Embryonic axis Complex carbohydrates are widespread throughout...

... is a foundational developmental process,during which the hierarchical specification of increasingly smaller and more specialized territories ultimately produces the three-dimensional animal. The primary embryonic axis, the anteroposterior or animal-vegetal axis, is usually specified by maternal mechanisms, while...

...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...

... 16 01 2001 © 2001 by Company 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...

... invertebrate and vertebrate in deuterostomes. * Author for correspondence (e-mail: [email protected] ) 03 06 1998 23 04 1998 © 1998 by Company of Biologists 1998 Embryonic axis Wnt GSK3β Sea urchin In the sea urchin embryo, the animal-vegetal (AV) axis...

.... * 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...

.... Drosophila embryo embryonic axis zygotic target genes zygotic pattern genes Copyright © 1991 by Company of Biologists 1991 * Bateson Memorial Lecture ...

... to design. We should also consider the possibility that a substance similar to scatter factor is present in the chick embryo at the time of formation of the embryonic axis. Here we show that early chick embryonic cells in vitro can respond to scatter factor from ras -NIH3T3 cells. Although we have...

... glycoconjugates embryonic axis The process of gastrulation results in the formation of the three primary germ layers and the establishment of the embryonic axis. In amniotes, the third of the layers to arise, the mesoderm, first condenses as a structure known as the primitive streak, which marks...