Listed are ELISA Kits for the detection of guanine nucleotide exchange factor, an alias name of SOS Ras/Rho guanine nucleotide exchange factor 2. The human protein, encoded by the gene SOS2, is 1332 amino acid residues long and has a mass of 152,979 daltons. However, there are up to 2 reported isoforms. The gene is associated with Noonan syndrome 9. This target may also be known as: son of sevenless homolog 2, guanine nucleotide releasing factor, NS9, and SOS-2.