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Catalytic properties of PDE6C, PDE6C-A, and PDE6C-B. The rates of cGMP hydrolysis by PDE6C, PDE6C-A, and PDE6C-B are plotted as a function of cGMP concentration. The Km and kcat values are as follows, respectively: PDE6C, 23 ± 1 μm and 5100 ± 100 s−1; PDE6C-A, 20 ± 2 μm and 4200 ± 150 s−1; and PDE6C-B, 22 ± 2 μm and 4300 ± 150 s−1. Results from one of three similar experiments are shown.
