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[Localization of several rhodopsin regeneration enzymes in retinal rods].

The distribution of NAD kinase and glucose-6-phosphate dehydrogenase within membranes of both outer and inner retina rod segments was studied by the sucrose gradient centrifugation of crude outer segment preparations. Rhodopsin and retinoldehydrogenase served as markers for outer segment membranes, whereas succinate dehydrogenase was a marker for inner ones. It is shown that NAD kinase and glucose-6-phosphate dehydrogenase are localized within inner segment membranes of the photoreception cell and that the activity of these enzymes in the crude preparations is due to contamination of the inner segments.