CORD-19:4abc50cfc81265083d4cb2aed0a493bb704d0b5b / 41640-41861 JSONTXT

{"project":"CORD-19-Sentences","denotations":[{"id":"TextSentencer_T206","span":{"begin":0,"end":221},"obj":"Sentence"},{"id":"T16972","span":{"begin":0,"end":221},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"To alleviate the degradation of RNA and enhance cellular uptake, methods such as gene gun, electroporation, liposomes, and cationic polymers have been used to obtain improved delivery systems for RNA vaccines [116, 120] ."}