RT Journal Article SR Electronic T1 An Extra Abnormal Chromosome in a Child with Mongolism and Acute Myeloblastic Leukemia JF Cleveland Clinic Journal of Medicine JO Cleve Clin J Med FD Cleveland Clinic SP 215 OP 224 VO 30 IS 4 A1 Robert D. Mercer A1 Martha K. Keller A1 Derrick Lonsdale YR 1963 UL http://www.ccjm.org/content/30/4/215.abstract AB