Fig. 3.

Sensitivity to PTX of SRIF effect onI_K. By the use of a voltage protocol similar to that in Figure 2, a family of I_K currents was recorded in rods pretreated for 16–20 hr with PTX (400 ng/ml).a, Exposure to 0.5 μm SRIF for 5 min failed to enhance I_K. b, There was no significant difference in the I–Vrelationship of I_K recorded in control solution and in the presence of SRIF. c, The histogram summarizes the effects of SRIF on I_K in control and PTX-pretreated rods. Numbers inparentheses in this and subsequent figures are the sample size.