Q.The heparin which is an anticoagulant present in the cells of :

The immune system's working cells fall into several categories. Lymphocytes (roughly 20–30% of white blood cells) include B cells, which mature in the bone marrow and, on activation, differentiate into antibody-secreting plasma cells or long-lived memory cells, and T cells, which mature in the thymus and differentiate into helper T cells (which activate B cells via cytokines) and killer T cells (which directly destroy infected or damaged cells). Monocytes and neutrophils are phagocytic cells that engulf foreign material directly; a matured monocyte …