..., respectively. Here, we report that organizer functions are executed not only by the dorsal and ventral margins, but also by all parts of the blastula-gastrula margin. The position of different marginal territories along the dorsoventral axis defines the A/P nature of the structures they are able to organize...

... for such systems to generate cell fate diversity. Oriented divisions also take place in the frog blastula, where orientation of the spindle into the apicobasal axis of polarised blastomeres generates inner and outer cells with different fates. Here, we show that, in this system, the spindle orients according...

... of component tissues at various stages. Our results demonstrate a novel role for the lower layer hypoblast and ADE in patterning overlying epiblast. * Author for correspondence (e-mail: susan.chapman@kcl.ac.uk ) 8 7 2003 © 2003. 2003 Blastula Expression Forebrain Gastrula Head...

... the molecular basis of the dorsal and ventral pathways is reviewed. * (e-mail: heasman@lenti.med.umn.edu ) 18 08 1997 © 1997 by Company of Biologists 1997 amphibian blastula pattern formation gastrulation Xenopus Amphibian embryos have long been favoured organisms...

... to maternal EP-cadherin mRNA into full-grown oocytes reduced the mRNA level in oocytes, and the protein level in blastulae. Adhesion between blastomeres was significantly reduced, as seen in whole embryos, and in assays of the ability of blastomeres to reaggregate in culture. This effect was especially...

... progressively so by cycle 13 the average cycle length has increased more than threefold. Fig. 1. Sequence of events during the blastula cell cycle. (A-D) Microphotographs showing blastomeres visualized during time-lapse recordings using Nomarski DIC optics. (A)Low-power view of cycle 11 cells, some...

... in a mid blastula, but has become independent of it by the late blastula stage. In animal caps induced to become mesoderm, the time when protein synthesis is required for subsequent elongation immediately follows the time of induction, and is not related to developmental stage. For elongation...

...Rachel M. Warga; Charles B. Kimmel Beginning during the late blastula stage in zebrafish, cells located beneath a surface epithelial layer of the blastoderm undergo rearrangements that accompany major changes in shape of the embryo. We describe three distinctive kinds of cell rearrangements. (1...

... blastula, deep layer (DEL) cells generate clones that are restricted to single deep embryonic tissues. The appearance of both the EVL and DEL restrictions could be causally linked to blastoderm morphogenesis during epiboly. A fate map emerges as the DEL cell lineages become restricted in the late blastula...

... of Biologists 1989 Xenopus oocyte egg blastula heparin-binding growth factors fibroblast growth factor transforming growth factor beta mesoderm-including factors Much interest has been aroused recently by the possibility of identifying the morphogens responsible for mesoderm induction...

... stage whereas control embryos developed to the stage of mouth formation. The results of the present study show that dormancy can be induced in blastulae by external application of adenosine. Our preliminary results show that treatment of fertilized starfish eggs with a 100 μ gml -1 concentration...