title: Fine structure of the fertilization membranes of sea urchin embryos.
mesh_terms: D000818:Animals; D002458:Cell Fractionation; D003553:Cystine / Q000494:pharmacology; D005260:Female; D005306:Fertilization; D006652:Histological Techniques; D008566:Membranes / Q000166:cytology* / Q000187:drug effects; D008623:Mercaptoethanol / Q000494:pharmacology; D008854:Microscopy, Electron; D008858:Microscopy, Phase-Contrast; D008867:Microtomy; D009024:Morphogenesis; D010063:Ovum / Q000166:cytology; D012617:Sea Urchins / Q000196:embryology; D013997:Time Factors; D014508:Urea / Q000494:pharmacology; D014817:Vitelline Membrane
chemical_list: D003553:Cystine; D008623:Mercaptoethanol; D014508:Urea