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Assay Method Information

Assay Name:  Factor XIa Assay
Description:  Factor XIa determinations were made in 50 mM HEPES buffer at pH 7.4 containing 150 mM NaCl, 5 mM CaCl2, and 0.1% PEG 8000 (polyethylene glycol; JT Baker or Fisher Scientific). Determinations were made using purified human Factor XIa at a final concentration of 40 pM (Sekisui Diagnostics) and the synthetic substrate, Z-Gly-Pro-Arg-AFC, TFA salt (Sigma #C0980) at a concentration of 100 μM.Activity assays were performed by diluting a stock solution of substrate at least tenfold to a final concentration ≦0.1 Km into a solution containing enzyme or enzyme equilibrated with inhibitor.
Affinity data for this assay
 

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Last update November 1, 2007
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