Heparin Cofactor Ii Deficiency, also known as thrombophilia due to heparin cofactor ii deficiency, is related to central retinal vein occlusion and thrombophlebitis. An important gene associated with Heparin Cofactor Ii Deficiency is SERPIND1 (Serpin Family D Member 1), and among its related pathways/superpathways are Response to elevated platelet cytosolic Ca2+ and Diseases of hemostasis. Affiliated tissues include bone marrow and bone, and related phenotypes are disseminated intravascular coagulation and recurrent deep vein thrombosis