PMC:7537225 / 20240-20258
Annnotations
LitCovid-sentences
{"project":"LitCovid-sentences","denotations":[{"id":"T136","span":{"begin":0,"end":18},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"Level‐2 variable)."}