Xuezhong Tan

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BACKGROUND Pyridoxal 5'-phosphate (PLP) is the biologically active form of vitamin B(6). Clinical studies suggest that low PLP concentrations are an independent risk factor for cardiovascular and other diseases. However, PLP concentrations are not routinely diagnosed because of the lack of a homogeneous, nonradioactive assay. We describe a homogeneous,(More)
Patients with vascular disease have significantly higher concentrations of plasma total cysteine (tCYS) than do healthy individuals (1–7). The present method is a new, rapid, and sensitive enzymatic colorimetric assay for tCYS in plasma samples and is homogeneous in that it avoids separation methods. The tCYS assay uses only the recombinant enzymes(More)
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