Spnb4 is an alias for the gene, Spectrin, beta, non-erythrocytic 4, in humans. Other names include: Spectrin beta chain, non-erythrocytic 4; Spectrin, non-erythroid beta chain 3; Beta-IV spectrin; QV; SPNB4; SPTBN3. The encoded protein has an amino acid length of 2564 and a mass of 289.0 kDa. Other isoforms may exist. Spnb4 is a member of the Spectrin family. This gene shares homology with other species, including: Rat, Frog, Chicken.