PubMed:32102777 / 1172-1179
Annnotations
LitCovid-PAS-Enju
{"project":"LitCovid-PAS-Enju","denotations":[{"id":"EnjuParser_T184","span":{"begin":0,"end":7},"obj":"NNS"}],"text":"strains"}
LitCovid-TimeML
{"project":"LitCovid-TimeML","denotations":[{"id":"tok211","span":{"begin":0,"end":7},"obj":"NNS"}],"text":"strains"}