1NPP:
reference: A spring-loaded state of NusG in its functional cycle is suggested by X-ray crystallography and supported by site-directed mutants., Knowlton JR, Bubunenko M, Andrykovitch M, Guo W, Routzahn KM, Waugh DS, Court DL, Ji X, Biochemistry 2003 Mar 4;42(8):2275-81. PMID: 12600194

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