Occurrences of putative SRSF2 sites in the cassette exons. Numbers of cassette exons (either more included or more excluded in mutant vs. WT SRSF2 cells) harboring UCCWG, UGGWG, and/or other putative sites are shown. Note that 66 exons do not harbor UCCWG, UGGWG, UGCWG, or UCGWG sites. These may be false positives of rMATS (66/374 = 18%), as is consistent with the ∼80% validation rate (∼20% false rate).