Random Image for gastrulas

Image originally shown at http://img.tfd.com/wn/10/60C32-gastrula.gif
Image for gastrulas
Possible definitions for gastrulas
gastrula
gastrula
n : double-walled stage of the embryo resulting from
invagination of the blastula; the outer layer of cells is
the ectoderm and the inner layer differentiates into the
mesoderm and endoderm
[also: {gastrulae} (pl)]
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