PMC:7784828 / 1962-2080 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T26","span":{"begin":6,"end":110},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"ency. In a record time frame, 36 vaccines have entered in clinical trials and 89 are in preclinical phase [3]. While i"}