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There May Be a Third Type of Photoreceptor in the Retina

Question 23

Multiple Choice

There may be a third type of photoreceptor in the retina that helps regulate our sleep and wake cycles. What type of photopigment do these cells contain?


A) Macular pigment
B) Melanopsin
C) Rhodopsin
D) Chromopsin
E) Vitreous humor

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