PCNA complexed with p15PAF, molecular model
Human PCNA complexed with p15PAF encircling DNA, molecular model. PCNA (proliferating cell nuclear antigen) is a DNA clamp acting as a processivity factor for DNA polymerase. This homotrimer (purple, cyan, pink) encircles the DNA (orange, green). The oncogenic protein p15PAF (yellow) occupies two subunits of the homotrimer; the DNA binds the unoccupied subunit., Photo by LAGUNA DESIGN/SCIENCE PHOTO LIBRARY
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