Abstract
AbstractBy comparison with a photoreceptor cell that has been exposed to light for at least several hours, a cell from an animal grown in darkness is deficient in both rough and smooth endoplasmic reticulum. The free ribosomes of cells under either condition appear to be single or randomly clumped. Illumination of a previously light deprived cell stimulates the formation of free polyribosomes having a characteristic, probably helical, organizaation. They are found at first in association with the rough endoplasmic reticulum, and after 30 minutes, fill the cell. The polyribosomes are mostly gone after two hours of illumination. Illumination also stimulates an increase in the amount of endoplasmic reticulum, which reaches its maximum density by 12 hours of illumination. The discussion is concerned with the possible significance of these light induced ultrastructural changes to the protein metabolism of the photo‐receptor cell.
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