2K29:
reference: Structural mechanism of transcriptional autorepression of the Escherichia coli RelB/RelE antitoxin/toxin module., Li GY, Zhang Y, Inouye M, Ikura M, J Mol Biol. 2008 Jun 27;380(1):107-19. Epub 2008 Apr 22. PMID: 18501926

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