PMC:7589163 / 425-476 JSONTXT

{"project":"LitCovid-PD-CHEBI","denotations":[{"id":"T1","span":{"begin":14,"end":22},"obj":"Chemical"},{"id":"T2","span":{"begin":27,"end":41},"obj":"Chemical"}],"attributes":[{"id":"A1","pred":"chebi_id","subj":"T1","obj":"http://purl.obolibrary.org/obo/CHEBI_33229"},{"id":"A2","pred":"chebi_id","subj":"T2","obj":"http://purl.obolibrary.org/obo/CHEBI_27027"}],"text":"ions. Several vitamins and trace elements play an i"}