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Bright blue times

The discovery of light-sensitive neurons that can adjust our body clocks prompted a search for their light-detecting molecule. We now know the identity of this pigment — and that these cells do more than was thought.

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Figure 1: The basic cell types of the vertebrate retina.
Figure 2: Animal photopigments consist of an opsin protein coupled to the 11-cis form of retinaldehyde (R).


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Foster, R. Bright blue times. Nature 433, 698–699 (2005).

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