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Interaction between TAT peptide and TAR RNA loop. The peptide is depicted in magenta with only the key arginine (Arg3 and Arg6) side chains are shown. Arg3 forms stable hydrogen bonds (dashed black lines) with G27, while Arg6 forms hydrogen bonds with G25. U22 and A26 of the U22-A26-U37 base triple are sandwiched by the two arginine residues.
