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A method is described for the preservation of iodopsin, the labile photopigment of daylight vision, by freeze drying in vacuo. The lipids released by the action of light on rhodopsin and iodopsin are found to be similar and to possess a labile absorption spectrum in chloroform, with a rising peak at about 390 mmicro and a declining peak in the region of 470 mmicro. After the change is complete the absorption spectrum resembles closely that of retinene.
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Alfred F. Bliss (1946) studied this question.
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