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FRETS-rVWF71 assays. (A) Change in fluorescence with the indicated volumes of PNP. (B) Dependence of initial rate on PNP. Lines were fitted by nonlinear regression. (C) ADAMTS13 inhibitor assay for plasma with an inhibitor titer of 4.5 U (95% confidence interval 4.1 to 5.0 U).
