Disc shedding in rodlike and conelike photoreceptors of tree squirrels.
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.
D000818:Animals; D001345:Autoradiography; D007930:Leucine / Q000378:metabolism; D009419:Nerve Tissue Proteins / Q000096:biosynthesis*; D010786:Photoreceptor Cells / Q000378:metabolism* / Q000648:ultrastructure; D012589:Sciuridae / Q000378:metabolism*; D014316:Tritium
D009419:Nerve Tissue Proteins; D014316:Tritium; D007930:Leucine