title: Fusion of fertilized and unfertilized sea urchin eggs. Maintenance of cell surface integrity.
mesh_terms: D000818:Animals; D002459:Cell Fusion; D002462:Cell Membrane / Q000648:ultrastructure; D003594:Cytoplasmic Granules / Q000648:ultrastructure; D005260:Female; D008855:Microscopy, Electron, Scanning; D008871:Microvilli / Q000648:ultrastructure; D010063:Ovum / Q000648:ultrastructure*; D012617:Sea Urchins; D015053:Zygote / Q000648:ultrastructure*