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Chronotype Genetic Variant in PER2 is Associated with Intrinsic Circadian Period in Humans.
Chang AM, Duffy JF, Buxton OM, Lane JM, Aeschbach D, Anderson C, Bjonnes AC, Cain SW, Cohen DA, Frayling TM, Gooley JJ, Jones SE, Klerman EB, Lockley SW, Munch M, Rajaratnam SMW, Rueger M, Rutter MK, Santhi N, Scheuermaier K, Van Reen E, Weedon MN, Czeisler CA, Scheer FAJL, Saxena R. Chang AM, et al. Sci Rep. 2019 Mar 29;9(1):5350. doi: 10.1038/s41598-019-41712-1. Sci Rep. 2019. PMID: 30926824 Free PMC article.
The human circadian system adapts to prior photic history.
Chang AM, Scheer FA, Czeisler CA. Chang AM, et al. J Physiol. 2011 Mar 1;589(Pt 5):1095-102. doi: 10.1113/jphysiol.2010.201194. Epub 2011 Jan 10. J Physiol. 2011. PMID: 21224217 Free PMC article. Clinical Trial.