Fig. 1

Fig. 1 Localization of gsc transcripts by in situ hybridization in wild-type late blastula and early gastrula. (a) Lateral view of an embryo at 45% epiboly (late blastula) showing gsc transcripts restricted to a group of deep cells at the dorsal margin of the embryo (animal pole up; dorsal, right). (b) Animal pole view of the same embryo. The territory of goosecoid expression occupies about 60° of the circumference of the embryo at the dorsal margin (dorsal, right; ventral, left). (e) Lateral view of an embryo at 60% epiboly (early gastrula). All goosecoid-expressing cells have involuted and the territory has begun to extend toward the animal pole. (d) Dorsal view of the same embryo showing that the gsc-expression territory now occupies the central part of the embryonic shield, the precursor of the prechordal plate (animal pole, up).