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  • Title: The photoreceptors and visual pigments in the retina of a boid snake, the ball python (Python regius).
    Author: Sillman AJ, Carver JK, Loew ER.
    Journal: J Exp Biol; 1999 Jul; 202 (Pt 14)():1931-8. PubMed ID: 10377274.
    Abstract:
    The photoreceptors and visual pigments of Python regius were studied using microspectrophotometry and scanning electron microscopy. The retina contains rods and cones, with rods constituting at least 90 % of the photoreceptor population. The rods are of a single type with long, narrow outer segments and are tightly packed. The wavelength of maximum absorbance ( &lgr; max) of the visual pigment in the rods is in the region of 494 nm. Two distinct types of cone are present. The most common cone, with a stout but stubby outer segment, contains a visual pigment with &lgr; max at approximately 551 nm. A relatively rare cone, with a long, slender outer segment, contains an ultraviolet-sensitive visual pigment with &lgr; max at approximately 360 nm. All the visual pigments have chromophores based on vitamin A1. The results are discussed in relation to the behavior of P. regius.
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