6B86:
reference: Preparation and characterization of metal-substituted carotenoid cleavage oxygenases., Sui X, Farquhar ER, Hill HE, von Lintig J, Shi W, Kiser PD, J Biol Inorg Chem. 2018 Aug;23(6):887-901. doi: 10.1007/s00775-018-1586-0. Epub, 2018 Jun 26. PMID: 29946976

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