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“Separate application of 3‐isobutyl‐1‐methylxanthine (IBMX), caffeine , theophylline, papaverine and RO 20‐1724 slowed down the time course of rod photo‐response to dim flashes of light.”
“Treatment of toad rods with phosphodiesterase inhibitors (3-isobutyl-1-methylxanthine, caffeine , theophylline, papaverine, and RO 20-1724) modifies the properties of the intracellular voltage responses to dim flashes of light.”