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...Transfection was performed using pn-Fect from Neuromics (Edina, MN). Briefly, retinal cells were grown for 4 d in LD cycles, until 24 h before analysis. At that time, coverslips with attached retinal cells were transferred to 400 µl of serum-reduced culture medium (Optimem; Invitrogen, Carlsbad, CA) in 24-well plates supplemented with 100 µl of solution containing pn-Fect with PLC{delta}-PH-GFP expression vector incorporated according to the manufacturer's instructions. In a series of pilot experiments, we determined that the maximum transfection efficiency occurred with a pn-Fect/DNA ratio of 1.4/1...