cis-retinal

cis-retinal

(sĭs′rĕt′ĭ-năl, rĕt″năl) [L. prefix cis-, this side of + ″]
The form of retinal combined with a glycoprotein opsin (rhodopsin in rods) during darkness. Light striking the retina changes it to trans-retinal and begins the generation of a nerve impulse.
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References in periodicals archive ?
More precisely, when an 11 cis-retinal (isomer of retinal) chromophore absorbs a photon, it isomerizes from 11-cis to all- trans state.
Absorption of a photon and photo-excitation of rhodopsin results in isomerization of its photopigment where cis-retinal is converted to all-trans retinal (Rozanowska 2005).