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scotopsin

[ skə-tŏpsĭn ]
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n.
The protein component of the pigment in the rods of the retina.
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Which of the following words describes “sky blue”?
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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