Thrombophilia Due to Thrombin Defect, also known as venous thromboembolism, is related to prothrombin thrombophilia and homocysteinemia. An important gene associated with Thrombophilia Due to Thrombin Defect is MTHFR (Methylenetetrahydrofolate Reductase), and among its related pathways/superpathways are Response to elevated platelet cytosolic Ca2+ and Complement cascade. The drugs Dydrogesterone and Nadroparin have been mentioned in the context of this disorder. Affiliated tissues include lung and spinal cord, and related phenotypes are homeostasis/metabolism and nervous system