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Cloverleaf structure of pneumococcal tRNAPhe. A and B, cloverleaf structures of pneumococcal (A) and E. coli (B) tRNAPhe (anticodon GAA). The distorted region in the acceptor stem of pneumococcal tRNAPhe was removed in the mutant species used in this study (termed tRNAPhe U4G) by replacement of the uracil at position 4 with a guanine.
