Fluorescent in situ hybridization studies of T and B lymphocytes.

T (A) and B (B) lymphocytes from 2 patients with myelofibrosis with myeloid metaplasia that exhibit a single orange signal revealing a deletion of the long arm of either chromosomes 20 (20q−) or 13 (13q−), respectively, by fluorescent in situ hybridization studies. Both green signals of the control probe (CEP9) are visible in each figure. Original magnification, × 100.