chemical with specified structure per- and polyfluoroalkyl substances 2025-03-21T14:08:22Z GEO:GSE262750 PFAS PFASs PMID:38963985 This is any condition in which the main influencing factor is a per- or polyfluoroalkyl substance. These are organofluorine compounds that have multiple fluorine atoms attached to an alkyl chain (perfluoroalkyl compounds have carbon chain atoms that are completely fluorinated and polyfluoroalkyl compounds have at least one of the carbon atoms in the alkyl chain not fully fluorinated). XCO:0001559 experimental_condition_ontology forever chemicals slaulederkind