title: Mosaic tetrasomy 21 in a liveborn male infant.
mesh_terms: D002869:Chromosome Aberrations; D002904:Chromosomes, Human, 21-22 and Y; D004314:Down Syndrome / Q000235:genetics*; D005347:Fibroblasts / Q000648:ultrastructure; D006801:Humans; D007231:Infant, Newborn; D007621:Karyotyping; D008214:Lymphocytes / Q000648:ultrastructure; D008297:Male; D009030:Mosaicism