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Fig. 1. Gastrulation morphology in D. melanogaster and A.
gambiae embryos. (A) Scanning electron micrographs of D.
melanogaster and A. gambiae embryos, ventral views. The apical
surface of a lateral neuroectoderm cell is colored blue and a mesoderm cell is
colored red. Note the constriction of the apical cell surface during
gastrulation. (B) Cross sections of gastrulating mosquito embryos after
hybridization with a digoxigenin-labeled twist antisense RNA probe.
The different panels show progressive time points starting with the stage
immediately preceding gastrulation (a) and ending with the completion of
gastrulation (f). Ingression of the mesoderm is best seen in e when some of
the mesoderm progenitors are inside the blastocoel while the rest are on the
surface. Staining in both top and bottom regions of e and f is due to germband
elongation.
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