Western blot analyses were carried out as described (24 (link)) using antibodies against U2AF35 (10334–1-AP, Protein Tech Group), U2AF65 (U4758, Sigma), actin (ab37063, Abcam), tubulin (ab56676, Abcam) and CAPERα (PA5–31103, Thermo Fisher Scientific). AntiXpress antibodies were purchased from LifeTechnologies (R910–25). Antibodies against PUF60, hnRNP C and hnRNP I (PTB) were a generous gift of Adrian Krainer, Gideon Dreyfuss and Christopher Smith, respectively.
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