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Structure of domain V of 23S rRNA of the E. coli strain K12 70S ribosome (Protein Data Bank entry 2WWQ). Peptidyltransferase center (PTC) loop regions are highlighted as follows: yellow, nucleotides 2057–2063; green, nucleotides 2447–2456; red, nucleotides 2496–2507; blue, nucleotides 2582–2588; cyan, nucleotides 2606–2611.
