Figure 6. Photoreceptor cells responded to 35 mM KCl stimulation three times with similar increases of [Ca²⁺]_in.

Cells were continuously superfused using Protocol II, as described in Methods. Three 6 min pulses of 35 mM K⁺ were delivered as indicated. The recording frequency was 1 ratio/10 s. This response is representative of those recorded from 8 cells.