title: A contribution to the special differentiation  of the mitochondria in the cleaving rat ovum.
mesh_terms: D000818:Animals; D002454:Cell Differentiation; D005260:Female; D005306:Fertilization; D008928:Mitochondria / Q000648:ultrastructure*; D010063:Ovum / Q000166:cytology*; D051381:Rats; D012100:Reproduction, Asexual