White blood cells whose cytoplasm is granular are called granulocytes. The granules are stained with Leishman stain. Its nucleus is 2-7 segmented. 72% of white blood cells are granulocytes. Their lifespan is 4-8 hours. They arise from the myeloblast cells of the bone marrow. Based on the dye holding capacity and the structure of the nucleus, they can be divided into three groups.