PMC:7499623 / 3255-3276
Annnotations
LitCovid-sentences
{"project":"LitCovid-sentences","denotations":[{"id":"T32","span":{"begin":0,"end":21},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"MATERIALS AND METHODS"}