5HY5:
reference: A Structure-Guided Switch in the Regioselectivity of a Tryptophan Halogenase Enzyme., Shepherd SA, Menon BR, Fisk H, Struck AW, Levy C, Leys D, Micklefield J, Chembiochem. 2016 Feb 3. doi: 10.1002/cbic.201600051. PMID: 26840773

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