The biological dimer of Aquifex aeolicus ribonuclease III (E110K) in complex with dsRNA (Aa-E110K•dsRNA) (Blaszczyk, Gan, Tropea, Court, Waugh, and Ji. Structure 2004; 12:457-466. Abstract).  The two endoNDs are shown as molecular surface; the two dsRBDs are illustrated as ribbon diagrams (helices as spirals, b-strands as arrows, and loops as pipes). The two subunits are colored in cyan and orange, respectively. The two RNA strands are shown as tube-and-stick models in blue and red, respectively.