PMC:7205724 / 4535-4554 JSONTXT

{"project":"LitCovid-sample-Enju","denotations":[{"id":"T740","span":{"begin":4,"end":6},"obj":"TO"},{"id":"T741","span":{"begin":7,"end":10},"obj":"DT"},{"id":"T742","span":{"begin":11,"end":18},"obj":"NN"}],"text":"ion to the residue "}