CORD-19:0049ba8861864506e1e8559e7815f4de8b03dbed / 3212-3328 JSONTXT

{"project":"CORD-19-Sentences","denotations":[{"id":"TextSentencer_T25","span":{"begin":0,"end":116},"obj":"Sentence"},{"id":"T39127","span":{"begin":0,"end":116},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"Unfortunately, many efforts to elicit such antibody responses by active immunization have not been successful [14] ."}