Besides HLA-B*51, susceptibility loci for BD have been identified at chemokine receptor types 1 and 3, signal transducer and activator of transcription protein family member 4, killer cell lectin-like receptor subfamily C, member 4, killer cell lectin-like receptor subfamily K, member 1, and endoplasmic reticulum aminopeptidase 1 (ERAP1) [5]. The gene discussed is ERAP1; the disease is Behcet disease.