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Morphologic characteristics of the bone marrow biopsy findings. (A) Patient with post-polycythemia myelofibrosis who developed 7% bone marrow blasts (group IB-2). CD34 highlights an increase in blasts (insert). (B) Patient with post-polycythemia myelofibrosis who developed accelerated phase (group AP). (C) Patient with polycythemia vera with neutrophilic progression (group OP). (D) Patient with primary myelofibrosis with monocytic progression (group OP).
