Fig. 7From: Identification of functional metabolic biomarkers from lung cancer patient serum using PEP technologyPurified GAPDH Increased Hexokinase Activity. To verify the proteins identified by mass spectrometry were indeed enhance the hexokinase activity, purified GAPDH was obtained from commercial source and added to the hexokinase activity assay system, and the enzyme activity was measured by measuring the NADP reduction at 340Â nmBack to article page