title: Sperm morphology and cytogenetic studies in ageing C57BL/6 mice.
mesh_terms: D000375:Aging; D000818:Animals; D001853:Bone Marrow / Q000648:ultrastructure; D002869:Chromosome Aberrations; D008297:Male; D008677:Metaphase; D051379:Mice; D008810:Mice, Inbred C57BL; D013076:Sperm Count; D013094:Spermatozoa / Q000002:abnormalities* / Q000648:ultrastructure; D013737:Testis / Q000033:anatomy & histology