A Venn diagram illustrating the tight coupling between neuronal activity and energy metabolism at the molecular level by having the same transcription factor, NRF-1, coregulating genes for critical glutamatergic neurochemicals (Grin1, Grin2b, Gria2, Nos1, and NR2B motor Kif17) as well as all 13 subunits of COX. Such coupling ensures that energy production exquisitely matches energy demand of neuronal activity.