title: Chronic myelocytic leukemia and identical twins. Additional evidence of the Philadelphia chromosome as postzygotic abnormality.
mesh_terms: D000293:Adolescent; D004200:Diseases in Twins; D006801:Humans; D015464:Leukemia, Myelogenous, Chronic, BCR-ABL Positive / Q000235:genetics*; D008297:Male; D010677:Philadelphia Chromosome; D014427:Twins; D014430:Twins, Monozygotic