title: Origin of calcified tissue in regenerating spines of the sea urchin, Strongylocentrotus purpuratus (Stimpson): a quantitative radioautographic study with tritiated thymidine.
mesh_terms: D000818:Animals; D001345:Autoradiography; D002455:Cell Division; D002465:Cell Movement; D002467:Cell Nucleus / Q000378:metabolism; D003238:Connective Tissue / Q000378:metabolism; D004447:Echinodermata / Q000033:anatomy & histology / Q000378:metabolism / Q000502:physiology*; D006097:Granulation Tissue / Q000378:metabolism; D006651:Histocytochemistry; D006652:Histological Techniques; D008938:Mitosis; D012038:Regeneration; D013936:Thymidine / Q000378:metabolism; D014316:Tritium
chemical_list: D014316:Tritium; D013936:Thymidine