3GTL: Backtracked Rna Polymerase II Complex With 13mer With G<>U M
reference: Structural basis of transcription: backtracked RNA polymerase II at 3.4 angstrom resolution., Wang D, Bushnell DA, Huang X, Westover KD, Levitt M, Kornberg RD, Science. 2009 May 29;324(5931):1203-6. PMID: 19478184

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