passages.id: 1.0alpha7.train.1313.sent
passages.type: sentence
passages.text: We provide evidence that the two subunits of U2AF bind to the Py-tract and distal AG to facilitate spliceosome assembly, and we identify the spliceosomal protein SPF45 as a second step splicing factor important for both recognition and utilization of the proximal 3′ ss of Sxl exon 3.
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