Using a whole-protein radiolabeled binding assay (RLBA) for validation, all seven proteins were immunoprecipitated by antibodies in both the PhIP-Seq APS1 discovery cohort (n = 39), as well as in the validation cohort of APS1 sera that had not been interrogated by PhIP-Seq (n = 28). The gene discussed is AIRE; the disease is Autoimmune polyendocrinopathy type 1.