EMBRYONIC INDUCTION IN THE ASCIDIA

Abstract

Isolations and transplantations of cells of Styela partita embryos were performed during the 4-32 cell stages. Only the anterior vegetal quadrant or a partial embryo containing a part of this region is capable of self-differentiation. The anterior vegetal region induces the differentiation of structures arising from other regions. Cerebral vesicle may be induced from presumptive epidermis, whereas muscle is induced only in presumptive muscle cells.