In a related study, M avium also induced the secretion of MMP‐1 in duodenal biopsy tissues, as well as in blood samples as compared to negative controls.46 This induction of MMP‐1 by M avium in duodenal tissue suggests that mycobacteria might contribute to the epithelial disruption commonly seen in enteropathies. The gene discussed is MMP1; the disease is Abnormal intestine morphology.