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Proteinase-activated receptor 3 (PAR3) is a member of the Proteinase-Activated Receptor subfamily. The enzyme thrombin is involved in the activation of platelets, leukocytes, endothelial cells, and mesenchymal cells at sites of vascular injury. These cellular responses are triggered through proteolytic activation of PAR3 and other receptors by thrombin. It is believed that PAR3 functions as a cofactor for the cleavage and activation of PAR4. PAR3 expression has been documented in blood, bone marrow, lung, spleen, and vessel. ESTs have been isolated from head/neck, skeletal muscle, and skin libraries.