Mutant human amyloid beta (APP*) combined Thy1 promoter which is specifically expressed in neurons, was induced to ES cells from DA strain rats, and chimera rats obtained from the ES cells. The F1 rats were backcrossed with Crl:CD (SD) strain rats and F3 rats was deposited to NBRP. The expression levels of mutant human APP mRNA are difficult among Lines (12>1>14>6).