title: [A rare karyotype [46xy, -21, +t (21q; 21q)] of Down's syndrome in an OSDZ twin].
mesh_terms: D002891:Chromosomes, Human, Pair 21; D004200:Diseases in Twins; D004314:Down Syndrome / Q000235:genetics*; D005260:Female; D006801:Humans; D007621:Karyotyping; D008297:Male; D008423:Maternal Age; D010375:Pedigree; D018566:Pregnancy, High-Risk; D014178:Translocation, Genetic; D014429:Twins, Dizygotic