. "The chemical reactions and pathways involving chitin, a linear polysaccharide consisting of beta-(1->4)-linked N-acetyl-D-glucosamine residues." . . . "chitin metabolism" . "chitin metabolic process" . "beta-1,4-linked N-acetylglucosamine metabolic process" . "beta-1,4-linked N-acetylglucosamine metabolism" . . . . . . .