Retinene reductase

It has been reported (Leiner and Leiner, 1944) and confirmed (Bowness et al., 1952) that retina contains high concentrations of zinc. Horse liver ADH oxidizes vitamin Ai and reduces retinene, probably being identical with retinene reductase (Bliss, 1949 Theorell and Bonnichsen, 1951a). 

As with iron, zinc is an essential nutrient for normal growth and reproduction, and promotes wound healing and tissue repair. Zinc is a key component of many vital enzymes involved in most metabolic pathways. It is part of the enzyme retinene-reductase required for the proper functioning of vitamin A, and therefore indirectly affects vision. Zinc is also part of carbonic anhydrase, which is responsible for the transfer of carbon dioxide, especially in hanoglobin and renal tubules, and of car-boxypeptidase, key in protein metabolism. It also forms a complex with insulin, increasing the activity of this hormone, and helps to increase the activity of thymidine... 

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