Figure 6

Patterning of the zebrafish neurectoderm is achieved by the parallel action of posteriorizing "transformative" signals and "activating" BMP-antagonists. (A-J) Neurectodermal regions are color coded as indicated with the most anterior territory represented in orange and the most posterior in blue. The BMP signaling gradient is indicated by grey shading, so that a brownish shading superimposed on the colored regions represent areas of the embryo unable to form neurectoderm due to the absence of an "activating" signal. Embryos of indicated genotype and treatment are diagrammed at 80-90% epiboly. See text for details.