MUC2 and celiac disease: Interestingly, Btnl1 and Btnl6 transcripts were downregulated in Btnl2-KO colitic mice, confirming previous reports in which Btnl1/6 transcripts were shown to be significantly reduced in the distal colon of Muc2-KO mice and BTNL8 expression was diminished or lost in colonic and duodenal biopsies of patients with UC and celiac disease, respectively5,32.