NOS2 and Alzheimer disease: Interestingly, Wong et al. [126] observed colocalization of AGEs and inducible nitric oxide synthase (iNOS) in a few astrocytes in the upper neuronal layers in the early stage AD brains, while, in late AD brains, there was a much denser accumulation of astrocytes colocalized with AGEs and iNOS in the deeper and particularly upper neuronal layers.