. "The chemical reactions and pathways resulting in the breakdown of chitin, a linear polysaccharide consisting of beta-(1->4)-linked N-acetyl-D-glucosamine residues." . . . . "chitin catabolism" . "chitin catabolic process" . "beta-1,4-linked N-acetylglucosamine catabolic process" . "beta-1,4-linked N-acetylglucosamine catabolism" . "chitin breakdown" . "chitin degradation" . . . . .