a homeodomain transcription factor expressed in the dorsal lip of the blastopore; may be a key factor is specifying these cells as the organizer of the embryo.
chordamesoderm Tissue in the amphibian gastrula that forms between ectoderm and endoderm in the dorsal lip region of the blastopore; develops into the mesoderm and notochord.
[Viktor Hensen, German anatomist and physiologist, 1835-1924] The thickened area at the anterior end of the primitive streak through which cells invaginate to form the notochord. It is homologous to the dorsal lip of the blastopore in amphibian ...
gray crescent - region of the egg seen in some amphibian zygotes formed by the 30 degree shift of cortical cytoplasm toward the site of sperm entry; it marks the future site of gastrulation initiation (dorsal lip of the blastopore).
 See also: Embryo, Blastopore, Dorsal, Cells, Protein
  
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