The differentiation of isolated amphibian ectoderm with or without treatment with an inductor : A scanning electron microscop study.

Amphibian gastrula ectoderm was isolated and examined by scanning electron microscopy after 24 h, 48 h, 6 and 10 days in culture.Contrary to the view which was formerly held, ectoderm is already detemined to form epidermis at the early gastrula stage. The ultrastructural differentiation of the epidermal cellsin vitro is very similar to their developmentin vivo (Billettet al.