PMC:7574920 / 29962-29984
Annnotations
LitCovid-sentences
{"project":"LitCovid-sentences","denotations":[{"id":"T221","span":{"begin":0,"end":22},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"Neg Neg 1 214 215"}