 Rad9 has been shown to be able to bind to the same promoter region as p53 that transactivates p21, which halts progression of the cell cycle by inhibiting cyclins and CDK’s.In addition to transactivating p21, Rad9 can also regulate transcription of the base excision repair gene NEIL by binding p53-like response elements in the gene promoter.RAD9A has been shown to interact with