Exosomes can carry Aβ1–42, Tau and its phosphorylated forms (e.g., p-Tauthr181 and p-Tauser396), lncRNAs, miRNAs and other proteins that constitute molecular hallmarks of AD and could help distinguish AD or mild cognitive impairment (MCI) patients from healthy individuals [146, 147]. Here, MAPT is linked to Alzheimer disease.