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Base peak chromatogram of the RNaseT1 digest of yeast U4 snRNA isolated from the Lsm3-associated RNP complex. The gel piece containing U4 snRNA was in-gel digested with RNaseT1 and subjected to the LC-MS analysis. Major oligoribonucleotide peaks assigned as RNase T1 fragments of yeast U4 snRNA are indicated by arrows with the corresponding sequence. Detailed data for MS/MS-based assignment of each fragment are given in Supplementary Table S3.
