F2 encodes thrombin, a serine protease central to hemostasis and inflammation. Thrombin cleaves fibrinogen to fibrin and activates coagulation factors V, VII, VIII, XIII, and XI, with factor XI activation enhanced by contact with negatively charged surfaces 12. Beyond coagulation, thrombin promotes pro-inflammatory cytokine production (MCP-1/CCL2, IL-8/CXCL8) in endothelial cells 34. The protein functions in diverse physiological processes including platelet activation, wound healing, and antimicrobial responses. F2 deficiency causes bleeding disorders, while dysregulation contributes to thrombophilia and recurrent pregnancy loss. Thrombin's protease activity also participates in fibrinolysis and extracellular matrix remodeling. Clinical significance includes its role in ischemic stroke pathogenesis, where excessive thrombin generation promotes thrombotic events. The protein's involvement in both pro-coagulant and pro-inflammatory pathways makes it a critical therapeutic target; anticoagulants inhibiting thrombin are foundational for stroke prevention and thrombosis management. Understanding F2 regulation is essential for balancing hemostatic requirements against thrombotic and inflammatory complications.