1NRT:
reference: A model of protein synthesis based on cryo-electron microscopy of the E. coli ribosome., Frank J, Zhu J, Penczek P, Li Y, Srivastava S, Verschoor A, Radermacher M, Grassucci R, Lata RK, Agrawal RK, Nature 1995 Aug 3;376(6539):441-4. PMID: 7630422

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