title: Letter: PH1 translocation involving chromosomes 21 and 22.
mesh_terms: D002869:Chromosome Aberrations; D002904:Chromosomes, Human, 21-22 and Y; D002906:Chromosomes, Human, 6-12 and X; D006801:Humans; D007621:Karyotyping; D007951:Leukemia, Myeloid / Q000235:genetics*; D008856:Microscopy, Fluorescence