MAPT and neurodegenerative disease: Specific peaks include “amyloid-beta” in 2018, “Alzheimer's disease,” “tau protein,” and “exosomes” in 2019, followed by “neuroinflammation,” “neurodegenerative diseases,” “blood markers,” “astrocyte,” “microglia,” and “extracellular vesicles” in 2020 and 2021.