Cell-Entering Molecules Detect Activity of Proliferating Cell Nuclear Antigen (image) University of Texas at Austin, Texas Advanced Computing Center Share Print E-Mail Caption Proliferating Cell Nuclear Antigen (PCNA) is a key protein in DNA replication and repair. During the DNA synthesis phase (S-phase) PCNA is recruited to sub-nuclear sites of DNA replication forming distinctive patterns over time that characterize different S-phase stages. Simulations on TACC's Stampede supercomputer helped researchers understand these processes. Credit Henry Herce Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.