title: Cytochalasin B inhibits sperm penetration into eggs of Urechis caupo (Echiura).
mesh_terms: D000818:Animals; D000845:Annelida / Q000187:drug effects*; D002467:Cell Nucleus / Q000648:ultrastructure; D003571:Cytochalasin B / Q000494:pharmacology*; D005260:Female; D005306:Fertilization / Q000187:drug effects*; D008297:Male; D010063:Ovum / Q000187:drug effects; D013045:Species Specificity; D013084:Sperm-Ovum Interactions / Q000187:drug effects*; D013094:Spermatozoa / Q000187:drug effects; D013997:Time Factors
chemical_list: D003571:Cytochalasin B