4V5K:
reference: Structural basis for 16S ribosomal RNA cleavage by the cytotoxic domain of colicin E3., Ng CL, Lang K, Meenan NA, Sharma A, Kelley AC, Kleanthous C, Ramakrishnan V, Nat Struct Mol Biol. 2010 Oct;17(10):1241-6. Epub 2010 Sep 19. PMID: 20852642

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