Mouse monoclonal to Foxp3.Forkhead box p3 (Foxp3) is a member of the forkhead/winged-helix family of transcriptional regulators. It plays a vital role in immune response. Mutations in Foxp3 are the cause of immunodeficiency polyendocrinopathy, enteropathy, X-linked syndrom (IPEX), also known as X-linked autoimmunity-immunoeficiency syndrome.