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A new type of solid-phase assay for proteases and protease inhibitors has been developed using biotinylated casein. The assay involves coating of titer plate wells with biotinylated casein, hydrolysis of this substrate with a protease such as trypsin, reaction of the biotin from the unhydrolyzed substrate with an alkaline phosphatase–streptavidin complex, and finally quantification of the amount of...
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