CASR and autoimmune polyendocrine syndrome type 1: Indeed, monoclonal antibodies isolated from individuals with type 1 diabetes mellitus have been employed successfully in identifying the antibody-binding sites on glutamic acid decarboxylase.(33) In future work, the isolation of anti-CaSR monoclonal antibodies from APS1 patients will allow a more complete and detailed analysis of the array of anti-CaSR antibodies and the epitopes they recognize.