title: The morphology of 16 and 17 day old bovine blastocysts from virgin and repeat breeder heifers.
mesh_terms: D000818:Animals; D001755:Blastocyst / Q000648:ultrastructure*; D002417:Cattle / Q000196:embryology*; D004624:Embryo Transfer / Q000662:veterinary; D005260:Female; D008854:Microscopy, Electron