cDNA encoding the human Swedish (K670N,M671L) amyloid precursor protein variant (770 isoform) was cloned into the pTSC vector in the mouse Thy1 gene. The linearized minigene was injected into prenuclear embryos from FVB/N females. Human mutant APP protein is expressed in hippocampus, parietal and frontal cortices at 2-5 times the endogenous APP levels, at lower levels in olfactory bulb and thalamus, and at very low levels in the cerebellum.