passages.id: 1.0alpha7.train.138.sent
passages.type: sentence
passages.text: The yeast PRP19 protein is not tightly associated with small nuclear RNAs, but appears to associate with the spliceosome after binding of U2 to the pre-mRNA and prior to formation of the functional spliceosome.
coreferences.id: 1.0alpha7.train.138.coref0
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