Fig. 7. Comparison between nucleolin RBD12–sNRE complex and the other RBD–RNA complexes. (A) Nucleolin RBD12–sNRE complex. (B) U1A RBD1 bound to U1 snRNA stem–loop II (Oubridge et al., 1994). (C) Sex-lethal RBD12–UGU₈ complex (Handa et al., 1999). (D) PABP RBD12–A₈ complex (Deo et al., 1999). Note that the location of the amino acids on the surface of the β-sheet varies among the different RBDs. In all panels, RBD1 is shown as a ribbon in cyan and RBD2 is in green. The RNA is in yellow, represented as sticks.