PMC:7543426 / 141-174 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T5","span":{"begin":7,"end":17},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"tract\n\nBackground\nDescriptions of"}