4RSL:
reference: Structural basis of the substrate specificity of the FPOD/FAOD family revealed by fructosyl peptide oxidase from Eupenicillium terrenum., Gan W, Gao F, Xing K, Jia M, Liu H, Gong W, Acta Crystallogr F Struct Biol Commun. 2015 Apr;71(Pt 4):381-7. doi:, 10.1107/S2053230X15003921. Epub 2015 Mar 20. PMID: 25849495

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