title: Changing size pattern of newly synthesized nuclear DNA during early development of the sea urchin.
mesh_terms: D000818:Animals; D002458:Cell Fractionation; D002467:Cell Nucleus / Q000187:drug effects / Q000378:metabolism*; D002499:Centrifugation, Density Gradient; D055598:Chemical Phenomena; D002621:Chemistry; D004247:DNA / Q000032:analysis / Q000096:biosynthesis* / Q000302:isolation & purification; D003902:Detergents / Q000494:pharmacology; D004447:Echinodermata / Q000166:cytology / Q000254:growth & development / Q000378:metabolism; D004625:Embryo, Nonmammalian / Q000166:cytology / Q000378:metabolism*; D005314:Embryonic and Fetal Development; D005374:Filtration; D006863:Hydrogen-Ion Concentration; D006882:Hydroxyapatites; D008970:Molecular Weight; D010447:Peptide Hydrolases; D013464:Sulfuric Acids / Q000494:pharmacology; D013936:Thymidine / Q000378:metabolism; D013997:Time Factors; D014316:Tritium / Q000378:metabolism
chemical_list: D003902:Detergents; D006882:Hydroxyapatites; D013464:Sulfuric Acids; D014316:Tritium; D004247:DNA; D010447:Peptide Hydrolases; D013936:Thymidine