Mucin-5AC (MUC-5AC) is a protein that is encoded by the MUC5AC gene in humans.[5][6][7]

AliasesMUC5AC, MUC5, TBM, leB, mucin, mucin 5AC, oligomeric mucus/gel-forming Quick facts MUC5AC, Available structures ...
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MUC-5AC is a large gel-forming glycoprotein. In the respiratory tract, it protects against infection by binding to inhaled pathogens, which are subsequently removed by mucociliary clearance. Overproduction of MUC-5AC can contribute to diseases such as asthma and chronic obstructive pulmonary disease,[8] and has also been associated with greater protection against influenza infection.[9]