Hans Spemann and Colleagues Developed the Concept of the Primary

Multiple Choice

Hans Spemann and colleagues developed the concept of the primary organizer in amphibian embryos while studying the

A) medial cells between the optic cups.
B) anterior terminus of the notochord.
C) lateral margins of the neural tube.
D) posterior edge of the dorsal ectoderm.
E) dorsal lip of the blastopore.