Leukaemia and chromosome 21.
D000208:Acute Disease; D002675:Child, Preschool; D002904:Chromosomes, Human, 21-22 and Y; D004260:DNA Repair; D004314:Down Syndrome / Q000235:genetics; D006801:Humans; D007938:Leukemia / Q000235:genetics*; D014314:Trisomy