美国奇利得（Gilead）科学公司已生产了一种修饰型的凝血酶，经灵长类动物试验证明，它是一种有效的不影响出血时间的抗凝剂。斯坦福大学血液系首席调研员teung博士指出，这对治疗严重心脏疾病可能是一个重要突破。凝血酶既能促进凝血又能防止凝血，高浓度引起血液凝固，而低浓 Gilead Scientific Inc. of the United States has produced a modified form of thrombin, which has been shown by primates to be an effective anticoagulant that does not affect bleeding time. Dr. teung, chief investigator of the Department of Hematology at Stanford University, pointed out that this may be an important breakthrough in the treatment of serious heart disease. Thrombin can both promote coagulation and prevent clotting, high concentrations cause blood coagulation, and low concentration