2DDD:
reference: The E1 mechanism in photo-induced beta-elimination reactions for green-to-red conversion of fluorescent proteins., Tsutsui H, Shimizu H, Mizuno H, Nukina N, Furuta T, Miyawaki A, Chem Biol. 2009 Nov 25;16(11):1140-7. PMID: 19942137

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