An enzyme that follows Michaelis-Menten kinetics has a KM value of 16.0 uM and a kcat value of 181 s-1. At an initial enzyme concentration of 0.0100 uM, the initial reaction velocity was found to be 1.07 x 10- uM/s. What was the initial concentration of the substrate, [S], used in the reaction ? Express your answer in micromolar to three significant figures

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