SRSF1 and influenza: To test this theory, genomes of 8 SARS-CoV-2 strains were downloaded from theGlobal Initiative on Sharing All Influenza Data (GISAID) database and analyzed using the IWMs for SRSF1, RNPS1 and hnRNP A1 (Table 3 for positive strand analysis; extended data39 Section 1 – Table 3 for analysis of both strands).