The Spemann-Mangold experiment: Transplantation of the dorsal lip of the blastopore from a donor to a host of a closely related species gave a second body axis. Most of this second body is made of host tissue. The donor tissue primarily forms the notochord.
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blastopore, organizer, spemann, mangold, xenopus, frog, twinned, twinning, tadpole, gastrulation, cortical rotation