ABC proteins bind to different sites on the ribosome. Comparison of the positions of EttA on the 70S ribosome (left), eEF3 on the 80S ribosome (center) and Dom34-Rli1 on the 80S ribosome (right). Top images show the entire ribosome, viewed down the subunit interface from above; bottom images show the large subunit viewed from the interface. Red, ABC proteins; green, P-site tRNA; magenta, A-site tRNA; orange, release-factor paralog Dom34.