CORD-19:4abc50cfc81265083d4cb2aed0a493bb704d0b5b / 42019-42304 JSONTXT

{"project":"CORD-19-Sentences","denotations":[{"id":"TextSentencer_T208","span":{"begin":0,"end":285},"obj":"Sentence"},{"id":"T3480","span":{"begin":0,"end":285},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"Finally, as to the optimization of mRNA for vaccination, several approaches have been conducted to modify the RNA molecule directly, such as the modification of the 5 cap structure or the untranslated and the translated regions, to achieve high and long-term antigen expression [121] ."}