XAB2 is a symbol for the gene, XPA binding protein 2, in humans. Other names include: Pre-mRNA-splicing factor SYF1; Protein HCNP; XPA-binding protein 2; SYF1 homolog, RNA splicing factor (S. cerevisiae); SYF1 pre-mRNA-splicing factor; HCNP; NTC90; SYF1. The encoded protein has an amino acid length of 855 and a mass of 100.0 kDa. Other isoforms may exist. XAB2 is a member of the Crooked-neck family. This gene shares homology with other species, including: Mouse, Rat, Zebrafish, Frog.