4KT6:
reference: High-resolution crystal structure of Streptococcus pyogenes beta-NAD(+) glycohydrolase in complex with its endogenous inhibitor IFS reveals a highly water-rich interface., Yoon JY, An DR, Yoon HJ, Kim HS, Lee SJ, Im HN, Jang JY, Suh SW, J Synchrotron Radiat. 2013 Nov;20(Pt 6):962-7. doi: 10.1107/S0909049513020803., Epub 2013 Sep 29. PMID: 24121349

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