title: The ultrastructure of the nuclei and the behaviour of the sex chromosomes of human spermatogonia.
mesh_terms: D001706:Biopsy; D002467:Cell Nucleus; D006651:Histocytochemistry; D006801:Humans; D008297:Male; D008854:Microscopy, Electron; D010472:Perchlorates; D012728:Sex Chromatin; D012730:Sex Chromosomes; D013094:Spermatozoa / Q000166:cytology*; D013737:Testis / Q000166:cytology*
chemical_list: D010472:Perchlorates