surface phenotypic characterization of megakaryoblasts , identified by platelet peroxidase activity , was investigated in four patients who showed increased proliferation of megakaryoblasts : one patient with typical features of acute leukemia , one presenting with acute myelofibrosis , and two with down 's syndrome in whom blasts disappeared spontaneously ( transient abnormal myelopoiesis , tam ) .
C0013080
down 's syndrome
C1834582
transient abnormal myelopoiesis