title: Autoradiographic study of the "X cells" in the human placenta.
mesh_terms: D000818:Animals; D001345:Autoradiography; D004247:DNA / Q000096:biosynthesis; D005260:Female; D006801:Humans; D008938:Mitosis; D010920:Placenta / Q000166:cytology*; D011247:Pregnancy; D011323:Primates; D013936:Thymidine; D014316:Tritium; D014327:Trophoblasts
chemical_list: D014316:Tritium; D004247:DNA; D013936:Thymidine