Color vision, ocular color discernment is attained with intricate neural mechanism in the eyes. Researchers from the Osaka City University in Japan Have discovered color discernment with an uncomplicated mechanism in the fish pineal organ, an extra ocular photosensitive organ on the surface of the brain.
Akihisa Terakita, a professor at the Graduate School of Science at Osaka City University in Japan said that Human color vision includes three kinds of photosynthesis molecules red, green, and blue susceptible opsins that are communicated in varied photoreceptor cells. Up till now it has been assumed that diverse kind of color opsins are needed to attain color detection.
But we found that an extremely straightforward mechanism depending on a solitary kind of opsin in a solitary kind of photoreceptor cell attains color identification namely UV and perceptible light distinction in the fish pineal organ. As per Terakita and his colleagues, Seiji Wada and Mitsumasa Koyanagi, assistant and associate professors at Osaka City University, the pineal organ of Zebrafish engages a pineal UV-sensitive opsin, called parapinopsin, which possess a special molecular property varied from visual opsins in eyes.
Both the pineal and visual opsins transform to a signaling active photoproduct upon light assimilation but their light states have varied molecular properties. The light state of parapinopsin is extremely sturdy and balanced, and transforms back to genuine dark state on perceptible light absorption while the light state of visual opsin is rocky and swiftly decays. As dark inactive and light active conditions of parapinopsin are sturdy this feature is called “bistable nature.”