title: Isolation of homologous nuclear DNAs from sea-urchin embryos.
mesh_terms: D000818:Animals; D002458:Cell Fractionation; D002467:Cell Nucleus / Q000032:analysis; D002499:Centrifugation, Density Gradient; D004247:DNA / Q000302:isolation & purification*; D008297:Male; D008970:Molecular Weight; D009693:Nucleic Acid Hybridization; D012617:Sea Urchins / Q000196:embryology*; D013094:Spermatozoa / Q000032:analysis; D014316:Tritium
chemical_list: D014316:Tritium; D004247:DNA