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Comparison of the effect of mRGS-r protein and RGS-4 protein on GTP hydrolysis by TD. The hydrolysis of GTP (10 μM) by 200 nM TD plus 10 μg of urea-treated ROS membranes was determined at the indicated concentrations of mRGS-r protein (•) or RGS-4 protein (□) after 10 min of incubation at 30°C. The data shown are mean ± SD of triplicate determinations.
