PMC:7537531 / 154-169
Annnotations
LitCovid-sentences
{"project":"LitCovid-sentences","denotations":[{"id":"T4","span":{"begin":6,"end":14},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"tract\nAbstract\n"}