IL4RA, or Interleukin 4 receptor, is a human gene encoded by IL4R. It may also be known as: Interleukin-4 receptor subunit alpha; IL-4 receptor subunit alpha; IL-4R subunit alpha; IL-4R-alpha; IL-4RA; CD antigen CD124; CD124. The encoded protein has an amino acid length of 825 and a mass of 89.7 kDa. IL4RA is a member of the Type I cytokine receptor family, Type 4 subfamily. Homologs of this gene exist in other organisms, including: Mouse.