Abstract
Summary
Our work with Hyla regilla shows that the mesoderm of the dorsal lip of the blastopore has little or no inherent capacity for involution. The material immediately around the early blastopore (the pharyngeal endoderm and prechordal mesoderm), although itself having a strong capacity for involution, does not bring about the involution of the mesoderm above it. On the other hand, excellent involution of the dorsal lip mesoderm occurs when it is transplanted together with laterally located mesoderm.
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