FIGURE 5.

Grb14^−/− rods have accelerated limiting time constant, suggesting faster inactivation of PDE6. Time in saturation was measured as time from the beginning of flash to time at which current had recovered to 25% of its dark value (see “Experimental Procedures”). Error bars indicate means and S.E. for 18 WT rods and 15 Grb14^−/− rods. The straight lines are best fitting slopes to means, giving values of the limiting time constant τ_D of 163 ms for WT and 122 ms for Grb14^−/− rods. See also Table 1.