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Phototransduction, excitation and adaptation

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Abstract

Vertebrate photoreceptors respond to light and transmit electrical signals to secondary neurons. In the dark, a steady current flows into the outer segment. The current is blocked in the light so that the cell elicits a hyperpolarizing response which is the primary phototransduction signal. The mechanisms generating this photoresponse are now well characterized, especially in the case of rod photoreceptors. The phototransduction process consists of an enzyme cascade including; a visual pigment (rhodopsin), a GTP- binding protein (transducin) and an enzyme hydrolyzing cGMP (cGMP-phosphodiesterase).

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© 1995 Springer Science+Business Media Dordrecht

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Kawamura, S. (1995). Phototransduction, excitation and adaptation. In: Djamgoz, M.B.A., Archer, S.N., Vallerga, S. (eds) Neurobiology and Clinical Aspects of the Outer Retina. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-0533-0_5

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  • DOI: https://doi.org/10.1007/978-94-011-0533-0_5

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