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Glyceraldehyde3-phosphatedehydrogenase(abbreviatedGAPDH)(EC1.2.1.12) isanenzymeofabout37kDathatcatalyzesthesixthstepofglycolysisandthusservestobreakdownglucoseforenergyandcarbonmolecules. Inadditiontothislongestablishedmetabolicfunction,GAPDHhasrecentlybeenimplicatedinseveralnon-metabolicprocesses, includingtranscriptionactivation, initiationofapoptosis,ERtoGolgivesicleshuttling,andfastaxonal,oraxoplasmictransport.Insperm,atestis-specificisoenzymeGAPDHSisexpressed.

