Figure 5. A pseudocolor animation of two photoreceptor cells treated with 35 mM K⁺ and 1 mM Co²⁺.

A pseudocolor animation of two photoreceptor cells treated with Co²⁺ as described in the legend to Figure 4, recorded with an emission-ratio frequency of 1/min. In this experiment, cells were recorded under basal conditions for minutes 1-5. The following changes were made to the superfusion medium at the times indicated: 5 min, the extracellular K⁺ concentration was increased to 35 mM; 10 min, the cells were exposed to 1 mM Co²⁺ in nominally Ca²⁺-free salt solution containing 35 mM K⁺; 21 min, Co²⁺ was removed and Ca²⁺ reintroduced in the continued presence of 35 mM K⁺; 27 min, the extracellular K⁺ concentration was lowered to basal levels (3.6 mM).

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