4A6N:
reference: Putative dioxygen-binding sites and recognition of tigecycline and minocycline in the tetracycline-degrading monooxygenase TetX., Volkers G, Damas JM, Palm GJ, Panjikar S, Soares CM, Hinrichs W, Acta Crystallogr D Biol Crystallogr. 2013 Sep 1;69(Pt 9):1758-67. doi:, 10.1107/S0907444913013802. Epub 2013 Aug 15. PMID: 23999299

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