Exosome complex, molecular model. This multi-protein complex functions to break up strands of RNA (ribonucleic acid, pink) during biochemical processes. The protein subunits are ribonucleases, enzymes that degrade RNA. The Rrp and other proteins are colour-coded, anti-clockwise from upper left: Rrp40 (grey), Rrp45 (pink), Rrp41 (beige), Rrp43 (dark blue), Rrp44 (white), Rrp42 (yellow), Csl4 (purple), Rrp4 (light blue).