aminoglycan catabolic process chitin metabolic process chitin catabolic process https://github.com/geneontology/go-ontology/issues/27107 https://github.com/geneontology/go-ontology/issues/28527 biological_process beta-1,4-linked N-acetylglucosamine catabolism chitin degradation chitin breakdown MetaCyc:PWY-6902 MetaCyc:PWY-6855 MetaCyc:PWY-7118 MetaCyc:PWY-7822 chitin catabolism 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. GO:0006032 beta-1,4-linked N-acetylglucosamine catabolic process glucosamine-containing compound catabolic process