The XRCC3 protein is one of four paralogs of RAD51, including RAD51B (RAD51L1), RAD51C (RAD51L2), and they each share about 25% amino acid sequence identity with RAD51 and each other.
The XRCC3 protein is one of five paralogs of RAD51, including RAD51B (RAD51L1), RAD51C (RAD51L2), RAD51D (RAD51L3), XRCC2 and XRCC3. 
