Involved in several processes, including cellular response to epidermal growth factor stimulus; cellular response to lipid; and response to vitamin A. Located in extracellular space. Used to study chronic obstructive pulmonary disease; dry eye syndrome; gastric ulcer; and stomach disease. Biomarker of asthma; gastric ulcer; otitis media; pulmonary fibrosis; and rhinitis (multiple). Human ortholog(s) of this gene implicated in dry eye syndrome. Orthologous to human MUC5AC (mucin 5AC, oligomeric mucus/gel-forming). [provided by Alliance of Genome Resources, Apr 2022]