Predicted to act upstream of or within defense response to bacterium and regulation of macrophage activation. Predicted to be located in intracellular membrane-bounded organelle. Predicted to be active in extracellular matrix and extracellular space. Biomarker of nasopharynx carcinoma. Human ortholog(s) of this gene implicated in bronchiolitis; idiopathic pulmonary fibrosis; and urinary bladder cancer. Orthologous to human MUC5B (mucin 5B, oligomeric mucus/gel-forming). [provided by Alliance of Genome Resources, Apr 2022]