L-Uridine is the enantiomer of D-uridine, a nucleoside that acts as a phosphate acceptor for nucleoside phosphotransferase, in the normal RNA component of a normal RNA isolated from Polyporaceae fungus Poria cocos (Schw.) L-Uridine has potential antiviral activity.

3-CPs (3-Carbethoxypsoralen) is a bleomycin-induced serotypic podoplanar polysaccharide in mouse lung fibrosis that belongs to the psoralen family and interferes with antibody-mediated bacterial killing.

Gastric mucin is a large glycoprotein which is thought to play a major role in the protection of the gastrointestinal tract from acid, proteases, pathogenic microorganisms, and mechanical trauma.