To perceive seasons, animals compare changes in day length with the constant cycle of their inner circadian clock. At a molecular level, light signals trigger coordinated gene-expression events in the brain.
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Okamura, H. Brain comes to light. Nature 452, 294–295 (2008). https://doi.org/10.1038/452294a
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DOI: https://doi.org/10.1038/452294a
