Abstract

Rod photoreceptors play a critical role for vision under dim light by providing the reliable detection and transmission of single photons. Phototransduction current in the rod outer segment and photocurrent from electrically coupled neighboring rods are central processes that shape the rod photovoltage in vertebrates in general. However, in mammals, the regulation and contribution of electrical coupling to the rod light response have remained unclear and controversial. In addition, the limited data available reflects the experimental difficulty to electrically access the inside of the mammalian photoreceptor because of its small size.

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