The analyzes revealed that ClK cells expressed HLA-DQA1 molecule and identified a narcolepsy-cataplexy associated allele (namely, HLA-DQB1*0602) (Lin et al., 2001), whereas no alleles associated with intestinal diseases (e.g., celiac disease, inflammatory bowel diseases) or co-morbidities were found (e.g., diabetes). The gene discussed is HLA-DQA1; the disease is inflammatory bowel disease.