3E9J:
reference: Preparation and structure of the charge-transfer intermediate of the transmembrane redox catalyst DsbB., Malojcic G, Owen RL, Grimshaw JP, Glockshuber R, FEBS Lett. 2008 Oct 15;582(23-24):3301-7. Epub 2008 Sep 5. PMID: 18775700

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