title: Initial chromosomal lesions induced by x-irradiating primary spermatocytes of mice.
mesh_terms: D000818:Animals; D002869:Chromosome Aberrations; D002875:Chromosomes / Q000528:radiation effects*; D008297:Male; D051379:Mice; D011830:Radiation Effects; D013094:Spermatozoa / Q000166:cytology / Q000528:radiation effects*; D013737:Testis / Q000166:cytology; D013997:Time Factors