PMC:7199903 / 707-718 JSONTXT

{"project":"LitCovid-sample-Enju","denotations":[{"id":"T104","span":{"begin":2,"end":4},"obj":"VB"},{"id":"T105","span":{"begin":5,"end":9},"obj":"VBN"}],"relations":[{"id":"R108","pred":"arg2Of","subj":"T105","obj":"T104"}],"text":"n be used t"}