#archenteron  central cavity of the gastrula; becomes the intestinal or digestive cavity
  supertype:  bodily_cavity__cavity__cavum  (anatomy) a natural hollow or sinus within the body
  part:  blastopore
  part of:  gastrula  double-walled stage of the embryo succeeding the blastula; the outer layer of cells is the ectoderm and the inner layer differentiates into the mesoderm and endoderm

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