Curiously, the mRNA expression levels of several myelin‐related genes were within normal values at AD stages V–VI/B–C, including MBP, PLP1, CNP, MAL, MOG and MOBP. Yet levels of MAG were decreased in ADV–VI/B–C when compared with MA (P = 0.032) (Figure 3). The gene discussed is CNP; the disease is Alzheimer disease.