APP or J20 mice expressed a human variant of APP containing the Swedish (K670N/M671L) and Indiana (V717F) familial Alzheimer's disease linked mutations, in neurons and oligodendrocytes (Figure S1), driven by the platelet‐derived growth factor‐beta chain (PDGF‐β) promotor (Mucke et al., 2000). Here, APP is linked to Alzheimer disease.