4ZXC:
reference: Crystal Structure of PnpCD, a Two-subunit Hydroquinone 1,2-Dioxygenase, Reveals a Novel Structural Class of Fe2+-dependent Dioxygenases., Liu S, Su T, Zhang C, Zhang WM, Zhu D, Su J, Wei T, Wang K, Huang Y, Guo L, Xu S, Zhou NY, Gu L, J Biol Chem. 2015 Oct 2;290(40):24547-60. doi: 10.1074/jbc.M115.673558. Epub 2015, Aug 24. PMID: 26304122

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