SRSF1 encodes the human gene, Serine/arginine-rich splicing factor 1. It may also be known as: ASF-1; Splicing factor, arginine/serine-rich 1; pre-mRNA-splicing factor SF2, P33 subunit; Alternative-splicing factor 1; splicing factor 2; alternate splicing factor; SR splicing factor 1; SF2; SF2p33; SFRS1; SRp30a. The encoded protein has an amino acid length of 248 and a mass of 27.7 kDa. Other isoforms may exist. SRSF1 is a member of the Splicing factor SR family. Homologs of this gene exist in other organisms, including: Fly, Frog.