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Science 14 March 1975:
Vol. 187. no. 4180, pp. 953 - 955
DOI: 10.1126/science.1145180
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Articles

Science, Vol 187, Issue 4180, 953-955
Copyright © 1975 by American Association for the Advancement of Science

articles

Disc shedding in rodlike and conelike photoreceptors of tree squirrels

DH Anderson and SK Fisher

Electron microscopic observations suggest that the rodlike and conelike photoreceptors of diurnal tree squirrels shed outer segment discs. Twenty-four hours after injection of triated L-leucine, the rodlike photoreceptors show a band of radioactivity at the base of the outer segment. The conelike photoreceptor outer segments show only a pattern of diffuse labeling. These results strongly suggest that disc shedding can occur in photoreceptor outer segments in which proteins are diffusely renewed.


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