SUN2 is a symbol for the gene, Sad1 and UNC84 domain containing 2, in humans. Other names include: SUN domain-containing protein 2; Rab5IP; Sad1/unc-84 protein-like 2; Protein unc-84 homolog B; UNC84B. The encoded protein has an amino acid length of 717 and a mass of 80.3 kDa. Other isoforms may exist. This gene shares homology with other species, including: Mouse, Rat.