5XNX:
reference: Crystallographic and solution structure of the N-terminal domain of the Rel protein from Mycobacterium tuberculosis., Singal B, Balakrishna AM, Nartey W, Manimekalai MSS, Jeyakanthan J, Gruber G, FEBS Lett. 2017 Aug;591(15):2323-2337. doi: 10.1002/1873-3468.12739. Epub 2017, Jul 25. PMID: 28672070

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