alzheimeranalysisantiatrophyautoimmunebarrierbloodconnectivitydifferencesdiseaseepilepsyhippocampalhumaniglon5improveinjurylanguagemechanismsmeetsmultipleneurodegenerationneurogenesisneurologyparkinsonprimaryprogressivesclerosisstudysurvivalsyndromestargettautherapeutictherapy