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The GUAAU pentaloop. (A) The X-ray crystal structure of a GUAAU pentaloop from the H.marismortui 23S large ribosomal subunit (PDB code 1FFX) (23) colored by nucleotide as described in Figure 3. (B) Overlay of the TER (blue) and rRNA (red) GUAAU pentaloops. The nucleotides which differ most in position from each other are highlighted by a lighter shade of blue or red in the TER and rRNA loops, respectively.
