Ctla4

CD152 is a 33 kD member of the immunoglobulin superfamily also known as CTLA-4 or Ly-56. It is expressed on activated T and B lymphocytes. CD152 is similar to CD28 in amino acid sequence, structure, and genomic organization and these two receptors share common B7 family counter-receptors (B7-1, B7-2). Whereas CD28 delivers a costimulatory signal in T cell activation, CTLA-4 negatively regulates cellmediated immune responses. CD152 is thought to play a role in the induction and maintenance of immunological tolerance, as well as the development of protective immunity and thymocyte regulation.