title: Ultrastructure of the "germ plasm" in eggs and embryos of Rana pipiens.
mesh_terms: D000818:Animals; D001001:Anura; D005260:Female; D005306:Fertilization; D006003:Glycogen / Q000032:analysis; D008854:Microscopy, Electron; D008928:Mitochondria; D010063:Ovum / Q000166:cytology*; D011894:Rana pipiens / Q000196:embryology*; D012270:Ribosomes; D013194:Staining and Labeling
chemical_list: D006003:Glycogen