Fig. 3. Gene expression profiles of single cells at the early gastrula stage; cells express a combination of markers. Animal, vegetal, DMZ and VMZ cells were isolated from stage 10 embryos and analyzed by dot blot or Southern blot (Fig. 2). Each block indicates the presence (coloured block) or absence (white block) of a marker gene. Each column represents the combination of marker genes seen in each cell. Those samples that did not show a signal for any marker are not included in the table. XK70A, an ectodermal gene, is represented in blue, mesodermal genes are represented in red, endodermal genes are represented in yellow, and Derrière, which is expressed in both mesoderm and endoderm, is represented in orange.