title: Effect of ageing on the volume, structure and total Leydig cell content of the human testis.
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D001706:Biopsy; D002452:Cell Count; D006801:Humans; D007985:Leydig Cells; D008297:Male; D008875:Middle Aged; D013737:Testis / Q000033:anatomy & histology / Q000473:pathology