Crystal structure of the NusB-NusE-dsRNA ternary complex from Aquifex aeolicus (Aa) . Residues involved in dsRNA binding are depicted as ball-and-sticks with white surface  (Stagno, Altieri, Bubunenko, Tarasov, Court, Byrd, and Ji. Nucl. Acids Res. June 7, 2011; Full Text).