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Thromboembolic diseases are currently one of the causes that endanger human health and lead to the highest mortality rate, such as myocardial infarction, cerebral thrombosis, deep vein thrombosis, cerebral embolism, pulmonary embolism, etc. In addition, thrombosis is an important pathological process involved in the pathogenesis of many diseases. 1. Anticoagulant therapy (1) Heparin: Heparin is a commonly used anticoagulant and is a highly sulfated glucosaminoglycan. Heparin is widely found in mammalian tissues, and mast cells are the main producing sites. The main sources of medicinal heparin are bovine lung and pig intestinal mucosa. Heparin used clinically is called unfraction heparin (UFH) because it is a mixture of components with different relative molecular weights. The relative molecular weight is between 33,000 and 30,000, which is also called standard heparin (SH). The drug name is heparin sodium. (2) Low molecular weight heparin: crude heparin is cracked into some fraction with relative molecular mass of 1000 ~ 12000 by chemical or enzymatic hydrolysis methods, and then purified. There are at least 10 kinds of low molecular weight heparin prepared by different manufacturers and different methods.至少也能尽力而为，求个心安，可是如今远隔万里，只能这么空担心，着实让人难受。　　围绕着正祖，僻派、时派与文人帮势力为各自的理想而战斗着。受伤的张寅衡将苏香菲拜托给了若镛后，杀进敌营。正祖在惠庆宫洪氏处听到有关思悼世子之死的惊人的秘密……园幸即将结束，他们的目的会达成吗？他便留下黎水看守溶洞，他们五人从黄龙寨以东，口含芦苇管，逆河水而上，潜到山边，来到暗河附近。Jay Chou