Normal-21-trisomy mosaicism. Report of four cases and review of the subject.
D000328:Adult; D002648:Child; D004314:Down Syndrome / Q000175:diagnosis*; D005260:Female; D006801:Humans; D007621:Karyotyping; D008297:Male; D008875:Middle Aged; D009030:Mosaicism / Q000175:diagnosis*