2LFW:
reference: Structural basis for sigma factor mimicry in the general stress response of Alphaproteobacteria., Campagne S, Damberger FF, Kaczmarczyk A, Francez-Charlot A, Allain FH, Vorholt JA, Proc Natl Acad Sci U S A. 2012 May 1. PMID: 22550171

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