biomacromolecule exopolysaccharide PMID:16075348 PMID:20718297 MetaCyc:Exopolysaccharides Wikipedia:Extracellular_polymeric_substance Wikipedia:Exopolysaccharide PMID:11160795 PMID:18097339 CHEBI:72813 PMID:15738217 PMID:6354590 extracellular polymeric substance chebi_ontology A biomacromolecule composed of carbohydrate residues which is secreted by a microorganism into the surrounding environment. exopolysaccharides PMID:1444258 PMID:11785425 PMID:2688547 PMID:17440912 PMID:20631870 extracellular polymeric substances PMID:19453747 PMID:20172021