title: An ultrastructural analysis of fertilization in the surf clam, Spisula solidissima. II. Development of the male pronucleus and the association of the maternally and paternally derived chromosomes.
mesh_terms: D000818:Animals; D002462:Cell Membrane; D002467:Cell Nucleus; D002875:Chromosomes; D003593:Cytoplasm; D004721:Endoplasmic Reticulum; D005260:Female; D005306:Fertilization; D008297:Male; D008540:Meiosis; D008974:Mollusca; D012728:Sex Chromatin; D013094:Spermatozoa / Q000166:cytology*