| Literature DB >> 4148001 |
Abstract
Mammalian photoreceptors contain a guanylate cyclase which has a high specific activity and is inhibited by exposure of the rod outer segment to light. Several minutes are required for this inhibition to take effect, indicating that it is not a step in visual excitation. The activity of the enzyme is sensitive to the concentration of calcium ion in the medium, suggesting that light-induced changes in calcium distribution in the photoreceptor could control guanylate cyclase activity.Entities:
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Year: 1973 PMID: 4148001 DOI: 10.1126/science.182.4117.1138
Source DB: PubMed Journal: Science ISSN: 0036-8075 Impact factor: 47.728