An extracellular region part that consists of a protective layer of mucus secreted by epithelial cells lining tubular organs of the body such as the colon or secreted into fluids such as saliva. Mucus is a viscous slimy secretion consisting of mucins (i.e. highly glycosylated mucin proteins) and various inorganic salts dissolved in water, with suspended epithelial cells and leukocytes. (Gene Ontology, GO_0070701)
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1 proteins localized to the mucus layer cellular component from the COMPARTMENTS Curated Protein Localization Evidence Scores dataset.