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Binding site of BoxA RNA on the NusB:NusE heterodimer. The crystal structure of heterodimeric NusB-NusE dimer from A. aeolicus in complex with single-stranded BoxA RNA was determined at 1.9-Å resolution (PDB: 3R2C). NusB residues are shown in cyan and NusE residues in orange as ball-and-stick models (Jason Stagno et al. Nucl. Acids Res. 39:7803-7815, 2011. PubMed: 21652641).