As of 1 April 2026, the PSJD database will become an archive and will no longer accept new data. Current publications from Polish scientific journals are available through the Library of Science: https://bibliotekanauki.pl
This review describes function and physico-chemical properties of gastrointestinal mucus. In perticular the role of mucins is shown. Recently studies of the chemical composition and structure of mucin is discussed. The biosynthesis of mucin and mechanism of viscoelastic gel-forming properties is described. In this review the function of mucus in gastric ulcer and cancer disease is shown.