4F5 is an alias for the gene, Small EDRK-rich factor 1A (telomeric), in humans. Other names include: Small EDRK-rich factor 1; h4F5; SMA modifier 1; Protein 4F5; spinal muscular atrophy-related gene H4F5; FAM2A; SERF1; SMAM1. The encoded protein has an amino acid length of 110 and a mass of 12.3 kDa. 4F5 is a member of the SERF family. This gene shares homology with other species, including: Frog, Chicken.