Keywords: Vegetal rotation.png en Cartoon depicting the movements associated with vegetal rotation A Early stage 10 blastula just prior to gastrulation B Late stage 10 gastrula C Stage 10 5 D Stage 11 Blue animal cap ectoderm; yellow vegetal endoderm; red Xbra-expressing mesoderm; orange goosecoid-expressing mesoderm arrowhead site of blastopore formation Double arrows show active movements; single arrows passive movement Adapted from Winklbauer Schürfeld 1999 User-created L'ontogenese 2010-03-01 Blastula Gastrula |