title: Evidence that the fertilization envelope blocks sperm entry in eggs of Xenopus laevis: interaction of sperm with isolated envelopes.
mesh_terms: D000818:Animals; D002462:Cell Membrane; D005260:Female; D005306:Fertilization; D066298:In Vitro Techniques; D008297:Male; D013084:Sperm-Ovum Interactions; D014817:Vitelline Membrane; D014981:Xenopus / Q000502:physiology*