title: Gametogenesis and incidence of Down syndrome.
mesh_terms: D004314:Down Syndrome / Q000453:epidemiology / Q000209:etiology*; D006801:Humans; D008297:Male; D009154:Mutation; D013093:Spermatogonia / Q000473:pathology*; D013094:Spermatozoa / Q000473:pathology*