passages.id: 1.0alpha7.train.1264.sent
passages.type: sentence
passages.text: To determine whether binding of U1 snRNP to the dsx pre-mRNA and factors to the ESE are independent or interdependent events required for the recruitment of SRm160/300, the ability of U1 snRNP to bind to the three dsx pre-mRNAs was analyzed by using a splicing complex affinity-selection assay (Fig. 3A; ref. 33). 
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