APP and Alzheimer disease: The 3xTg-AD-H mice that overexpress two mutated human transgenes, Swedish APP (KM670/671NL) and MAPT (P301L) driven by the exogenous neuronal Thy1.2 promoter, with a knock-in mutation of Psen1 (M146V) that promotes formation of Aβ plaques and NFTs, also exhibit behavioural symptoms and Aβ and Tau pathologies before 12 months of age17.