Image:555px-1axc tricolor.png

Assembled human PCNA (PDB ID 1AXC), a sliding DNA clamp protein that is part of the DNA replication complex and serves as a processivity factor for DNA polymerase. The three individual polypeptide chains that make up the trimer are shown.

Source - Self created from PDB entry 1AXC using the freely available visualization and analysis package VMD

Date - 30 Sept 2006 Author - Opabinia regalis (GFDL image from Wikipedia)