This process further facilitates the binding of SRSF1 to its RNA target Ron ESE (AGGCGGAGGAAGC), an RNA oligomer designed by the SRSF1 exonic enhancer sequence.25 A phosphoproteomic analysis of gastric tumor and patient-derived xenograft (PDX) samples identified that SRSF2 was hyperphosphorylated in tumor samples. Here, SRSF1 is linked to neoplasm.