Drosophila NINAC is a putative target of cAMP modulation. A, Responses to 10 msec flashes recorded in photoreceptors from Drosophila mutantsninaCP235, ninaCΔ132, andninaCΔ174 in the absence (solid traces) and presence (dotted traces) of IBMX (100 μm, bath). Similar data were obtained with 8-Br-cAMP. B, C, Time-to-peak (B) and time-to-half-decay (C) of macroscopic light responses in photoreceptors from ninaC P235,ninaC Δ132, andninaCΔ174 in the absence and presence of 100 μm IBMX. Mean ± SD;n = 4–8 cells. *p < 0.05.