title: Calcium dependence of the acrosome reaction and activation of guinea pig spermatozoa.
mesh_terms: D000818:Animals; D002118:Calcium / Q000494:pharmacology*; D003470:Culture Media; D005306:Fertilization / Q000187:drug effects*; D006168:Guinea Pigs; D008274:Magnesium / Q000494:pharmacology*; D008297:Male; D008854:Microscopy, Electron; D013094:Spermatozoa / Q000187:drug effects / Q000502:physiology* / Q000648:ultrastructure
chemical_list: D003470:Culture Media; D008274:Magnesium; D002118:Calcium