Concerning other olfactory functions, a recently published study (Lian et al., 2019) investigated the relationship between the threshold discrimination identification score and CSF Aβ and tau levels in AD patients with or without olfactory dysfunction (OD), finding that only t-tau levels were significantly lower in the AD-OD group, but the significant correlation disappeared after adjusting for age, sex, education, and disease duration. The gene discussed is MAPT; the disease is Alzheimer disease.