"Study report a previously uncharacterized protein SAN1 the Fam120b gene product as a 5' exonuclease that acts independently of the Fanconi anemia pathway in response to inter-strand DNA cross-links (ICLs). Deletion of SAN1 in HeLa cells and mouse embryonic fibroblasts causes sensitivity to ICLs. SAN1 binds to senataxin (SETX). SAN1-SETX binding is increased by ICLs and is required to prevent cross-link sensitivity."xsd:string