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The AT(N) (amyloid-Tau-neurodegeneration) classification define “A” biomarkers as amyloid positron emission tomography (PET), cerebrospinal fluid (CSF) Aβ42 and CSF Aβ 42/40, “T” refers to Tau PET and CSF p-Tau, and “N” is shown by structural magnetic resonance imaging, fluorodeoxyglucose (FDG) PET, CSF total Tau (t-Tau) and neurofilament light chain protein (NFL).
