title: Down's syndrome in the offspring of young parents: evidence for an x-borne dominant mutation?
mesh_terms: D000328:Adult; D000367:Age Factors; D004314:Down Syndrome / Q000235:genetics*; D005260:Female; D005799:Genes, Dominant; D006801:Humans; D008297:Male; D009030:Mosaicism; D009154:Mutation; D014960:X Chromosome