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CHRONIC MYLELOGENOUS LEUKEMIA (also called MYELOGENOUS LEUKEMIA), many MYELOBLASTS (Immature white blood cells or leukocytes), 250X. This is a human blood smear showing numerous Myeloblasts (immature white blood cells or leukocytes). It also shows an Eosinophil with reddish granules and a bilobed nucleus, and a BAND CELL (near the center, has a horseshoe-shaped nucleus) that develops into a NEUTROPHIL (the most common white blood cell). Large numbers of these is considered abnormal. These cells originate in the red bone marrow (MYELOID tissue), hence the name Myelogenous. Leukemia is a cancer of the blood forming tissues, and involves an abnormal proliferation of white blood, cells (leukocytes), many of which are immature, and do not perform normal functions. This great increase in leukocytes can also crowd out red blood cells and platelets. This image also shows numerous, smaller red blood cells (erythrocytes).