1N9L:
reference: Crystal structures and molecular mechanism of a light-induced signaling switch: The Phot-LOV1 domain from Chlamydomonas reinhardtii., Fedorov R, Schlichting I, Hartmann E, Domratcheva T, Fuhrmann M, Hegemann P, Biophys J 2003 Apr;84(4):2474-82. PMID: 12668455

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