Likely to be an auxiliary protein of DNA polymerase delta complex and is probably involved in the control of DNA replication and repair by increasing the polymerase's processibility (PubMed:17087725). May function independently of PCNA during DNA repair (PubMed:17087725). Homotrimer (PubMed:17087725). Interacts with the catalytic subunits of two DNA polymerase complexes: PolD1 in the delta complex and PolE1/DNApol-epsilon255 in the epsilon complex (PubMed:17087725). Increased association with chromatin in response to DNA damage caused by methyl methanesulfonate (MMS) and hydrogen peroxide (H2O2), but not in response to DNA damage by UV. Ubiquitously expressed throughout development and in adults. Belongs to the PCNA family.