PMC:7405836 / 136896-136990 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T917","span":{"begin":0,"end":94},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"The possibility of crossing the species barrier again for the fourth time cannot be ruled out."}