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Steady-state ATPase activity of kinesin (HK560) with mutant MTs. The data shown in this graph are a representative example of the measurements for wild-type and mutant MTs. The maximal turnover rate (kcat) and apparent Michaelis–Menten constant (K0.5MT) were calculated by fitting the data to a hyperbola, and the averages obtained from four to six sets of experiments are shown in Table I.
