Accelerated phase chronic myelogenous leukemia is a phase of chronic myelogenous leukemia in which the disease is progressing. Chronic myelogenous (or myeloid leukemia ( CML) is a form of Leukemia characterized by the increased and unregulated growth of predominantly Myeloid cells In this phase, 6% to 30% of the cells in the blood and bone marrow are blast cells (immature blood cells). Blood is a specialized Bodily fluid that delivers necessary substances to the body's cells €”such as nutrients and oxygen—and transports Waste products Bone marrow is the flexible tissue found in the hollow interior of Bones In adults marrow in large bones produces new Blood cells It constitutes 4% of The myeloblast is a unipotent stem cell which will differentiate into one of the actors of the Granular series "Immature" redirects here For info on the general word see Wiktionary article Immature A blood cell (also called blood corpuscle) is any cell of any type normally found in Blood.