Five human RAD51 homologs have been identified: XRCC2, XRCC3, RAD51B, RAD51C, and RAD51D. Each of these homologs interacts with one or more of the others, with all of the proteins involved in one complex or multiple smaller complexes. XRCC3 (x-ray cross complementing) was first identified as a human gene complementing the DNA damage sensitivity, chromosonal instability and impaired growth of the mutant hamster cell line irs1SF. This fact coupled with XRCC3 being a member of the RAD51 gene family have implied a role in the repair of DNA damage by homologous recombination.
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HEK293T cells were transfected with the pCMV6-ENTRY control or pCMV6-ENTRY XRCC3 (RC200326) cDNA for 48 hrs and lysed. Equivalent amounts of cell lysates (5 ug per lane) were separated by SDS-PAGE and immunoblotted with anti-XRCC3.