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