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杀菌／渗透性增加蛋白[bactericidal／Permeability－increasingprotein（BPI）]是在人类嗜中性白细胞的嗜蓝颗粒（azurophi－licgranules）一中发现的一种阳离子蛋白。它具有杀灭革兰氏阴性细菌和中和内毒素的能力，因此不管是在局部和全身性的感染过程中，它都是机体防御机能
Bactericidal / Permeability-increasing protein (BPI) is a cationic protein found in azurophil-licgranules of human neutrophils. It has the ability to kill Gram-negative bacteria and neutralize endotoxins, so it is an organism defensive function, both in the case of local and systemic infections