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Spectrofluorimetric measurement of the affinity of full-length factor XI for β-SPGG-2 (○), β-SPGG-8 (■), UFH (●), and H8 (◇) at pH 7.4 and 37 °C using intrinsic tryptophan fluorescence (λEM = 348 nm, λEX = 280 nm). Solid lines represent nonlinear regressional fits using quadratic eq 4
