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Fig. 9. Archenteron elongation requires Xdsh function during early but not late
gastrula stages. Archenteron elongation is disrupted in dorsally and
circumferentially injected embryos at mid-gastrula (A)
(***P<0.001; n=36 control, 30 dorsal, 21
circumferential) and late-gastrula (***P<0.001;
n=38 control, 52 dorsal, 23 circumferential) stages. The fraction of
the archenteron (red arrowhead at anterior limit) overlain by the
Xnot domain (yellow arrowhead) is very different between control and
experimental embryos, demonstrating that the lengthening of the archenteron is
proceeding in the absence of convergent extension. (C) Archenteron anterior
expansion is not statistically different between Xdd1-injected embryos, at
late gastrula stages.
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