title: Formation of the blastocyst: determination of trophoblast and embryonic knot.
mesh_terms: D000818:Animals; D001755:Blastocyst / Q000166:cytology*; D002454:Cell Differentiation; D002678:Chimera; D005260:Female; D051379:Mice; D011247:Pregnancy; D011817:Rabbits; D014327:Trophoblasts / Q000166:cytology*