1H3L:
reference: Identification and structure of the anti-sigma factor-binding domain of the disulphide-stress regulated sigma factor sigma(R) from Streptomyces coelicolor., Li W, Stevenson CE, Burton N, Jakimowicz P, Paget MS, Buttner MJ, Lawson DM, Kleanthous C, J Mol Biol. 2002 Oct 18;323(2):225-36. PMID: 12381317

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