title: Parental mosaicism as a cause of Down syndrome. A report of 46,XX/46,XX,--21,+t(21q21q1 mother and 46,XY,+21,+t(21q21q) child.
mesh_terms: D000328:Adult; D004314:Down Syndrome / Q000235:genetics*; D005260:Female; D006801:Humans; D008423:Maternal Age; D009030:Mosaicism; D014178:Translocation, Genetic