GAPDH is a symbol for the gene, Glyceraldehyde-3-phosphate dehydrogenase, in humans. Other names include: GAPDH; Peptidyl-cysteine S-nitrosylase GAPDH; G3PD; GAPD; HEL-S-162eP. The encoded protein is an enzyme with an amino acid length of 335 and a mass of 36.1 kDa. GAPDH is a member of the Glyceraldehyde-3-phosphate dehydrogenase family. This gene shares homology with other species, including: Frog.