PubMed:8349644 / 298-548 JSONTXT

{"project":"sentences","denotations":[{"id":"T4","span":{"begin":0,"end":250},"obj":"Sentence"},{"id":"T4","span":{"begin":0,"end":250},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"Both activities are required together with several other protein factors and U1 and U2 small nuclear ribonucleoproteins for the assembly of a presplicing complex which represents the first ATP-dependent step in the assembly of the active spliceosome."}