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The organizer concept and modern embryology: Anglo American perspectives

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Figure

Fig. 1. The Spemann-Mangold organizer experiment. A graft, taken fromnear the blastopore of a pigmented amphibian embryo, is transplanted to adifferent site in an un-pigmented embryo; the transplant initiates a secondaryinvagination and gastrulation, which
Fig. 2. Hans Spemann (left) with Ross Harrison.
Fig. 3. The amphibian fate map. Labelled, undifferentiated cells marked at the early gastrula stage (left) can be followed through their variousmorphogenetic cell movements during succeeding developmental stages until they reach approximately their final p
Fig. 4. Exogastrulation. Under certain culture conditions, the early gastrula undergoesevagination movement (shown [left] through two stages by arrows) in place of the invaginationof normal gastrulation
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