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. 2001 Aug;183(16):4910–4913. doi: 10.1128/JB.183.16.4910-4913.2001

FIG. 3.

FIG. 3

Kinetic parameters of the yeast purine nucleoside phosphorylase. (A) Determination of the Km for inosine using a xanthine oxidase-coupled assay. Vmax (horizontal line) and Km were calculated by nonlinear regression analysis of the saturation curve. (B) The Ki for guanosine was determined by linear regression of the data presented in the Dixon plot.