title: About the DNA-synthesis during the early development of Paracentrotus lividus, Arbacia lixula and their hybrids.
mesh_terms: D002875:Chromosomes; D004247:DNA / Q000096:biosynthesis*; D004447:Echinodermata / Q000378:metabolism*; D005306:Fertilization; D006824:Hybridization, Genetic; D013936:Thymidine / Q000378:metabolism*; D014316:Tritium
chemical_list: D014316:Tritium; D004247:DNA; D013936:Thymidine