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Fig. 13. Dissociability of archenteron elongation and blastopore closure. (A) Plot
of blastopore closure versus archenteron elongation for 97 normal embryos of
various gastrula stages. (B,C) Embryos with highly similar archenterons and
very different blastopores, indicated in A with pink points. (D,E) Embryos
with highly different archenterons and very similar blastopores, indicated in
A with purple points. The anterior limit of the archenteron is indicated with
a red arrowhead. Nieuwkoop and Faber standard stages are presented for
reference (Nieuwkoop and Faber,
1994), with the size of the circles approximately corresponding to
the predicted variability.
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