title: Cortical changes in Spisula eggs upon insemination.
mesh_terms: D000818:Animals; D049872:Bivalvia / Q000648:ultrastructure*; D002462:Cell Membrane / Q000648:ultrastructure; D003593:Cytoplasm / Q000648:ultrastructure; D003594:Cytoplasmic Granules / Q000648:ultrastructure; D005260:Female; D005614:Freeze Fracturing; D010063:Ovum / Q000648:ultrastructure*; D015053:Zygote / Q000648:ultrastructure*