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Figure 2 A sigmoid relationship between serum thromboxane (TX) (ng/ml) on the y-axis and platelet TX (ng/ml) (TX generated when exogenous arachidonic acid is added to platelets) on the x-axis is evident (n = 45, R2 = 0.67). The point of inflection of the graph occurs at a serum TX level of 2.2 ng/ml.