GAP43 and Mental deterioration: Biomarkers of synaptic pathology (e.g., neurogranin, Growth associated protein 43 (GAP‐43), Synaptosomal‐associated protein 25 (SNAP‐25), Neuronal pentraxin‐2 (NPTX2)) are correlated with disease progression or cognitive decline in AD.27, 28, 29