Disc shedding in rodlike and conelike photoreceptors of tree squirrels
- PMID: 1145180
- DOI: 10.1126/science.1145180
Disc shedding in rodlike and conelike photoreceptors of tree squirrels
Abstract
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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