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文献和实验Here we describe in more depth the previously published application of the fluorescent probe 4,5-diaminofluorescein (DAF-2) in order to reliably measure low levels of nitric oxide (NO) as released from human endothelial cells invitro . The used
A Nonradioactive Assay for Nitric Oxide Synthase Activity in Tissue Extracts
We describe a fluorescence assay for nitric oxide synthase activity based on a new indicator, 4,5-diaminofluorescein (DAF-2). The method offers the advantage of being safer and more convenient than the citrulline radioassay in common use
DAF的迁移率接近于膜类脂的迁移率,比大多数膜蛋白迁移率高一个数量级。认为这有助于促进数目有限的膜DAF分子与细胞表面大量的C3b或C4b片段接触。另外DAF的糖磷脂酰肌醇结构还可能具有转导细胞信号的作用。 除Nicholson-Weller等证实的分子量为70kDa的膜DAF外,Kinoshita等(1987)用Western blotting在人红细胞表面还检出分子量为140kDa的一种膜DAF,称其为DAF-2。DAF-2在膜上的数目不足70kDa膜DAF的1/10
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