The XRCC3 protein is one of five paralogs (homology) of RAD51, including RAD51B (RAD51L1), RAD51C (RAD51L2), RAD51D (RAD51L3), XRCC2 and XRCC3 and they each share about 25% amino acid sequence identity with RAD51 and each other.
DNA repair protein XRCC3 is a protein that in humans is encoded by the XRCC3 gene. The XRCC3 protein is one of five paralogs of RAD51, including RAD51B (RAD51L1), RAD51C (RAD51L2), RAD51D (RAD51L3), XRCC2 and XRCC3. They each share about 25% amino acid sequence identity with RAD51 and each other. 
