PMC:7796291 / 20848-20852
Annnotations
LitCovid-sentences
{"project":"LitCovid-sentences","denotations":[{"id":"T169","span":{"begin":0,"end":4},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"3.3."}