A mammalian neural tissue opsin (Opsin 5) is a deep brain photoreceptor in birds.
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Proc Natl Acad Sci U S A. 2010 Aug 24;107(34):15264-8. doi: 10.1073/pnas.1006393107. Epub 2010 Aug 2.
Proc Natl Acad Sci U S A. 2010.
PMID: 20679218
Free PMC article.