G6PD and infection: For example, Mycoplasma pneumoniae induces production of ROS following infection, and the over-expression of some cellular proteins, in particular, glucose-6-phosphate 1-dehydrogenase (G6PD), NADH dehydrogenase (ubiquinone) Fe-S protein 2, and ubiquinol-cytochrome c reductase complex core protein I mitochondrial precursor indicated their involvement in regulating cellular oxidative status.