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Cone visual pigments are responsible for color vision. Using low-temperature spectroscopy and linear/logarithmic time scale flash photolysis, we studied the photochemistry of the cone visual pigment P521 from the lizard Gekko gekko. We found both meta I and meta I1 intermediates in this cone pigment; meta I absorbs a t 480 nm, and meta I1 absorbs at ca. 380 nm. The formation of meta I is a fast process with a lifetime of 2.8 ps for the slow component (pH 6.70, 8.0 O C , 2% digitonin) compareddoi:10.1021/bi00214a018 pmid:8260505 fatcat:u4zt5kc7cjcdzlxzhtvvzdcqgi