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\label{tauAndSenilePlaquesImaging_Villemagne2015} Figure reproduced from \cite{Villemagne_2015} showing MRI and PET imaging of tau and A$\beta$ in healthy controls, MCI and an AD patient. Top two rows show that A$\beta$ deposition could be seen either present or absent  in NCs; the NCs.  In second row  tau deposits when present are in NC is  seen only in hippocampal region. MCI and AD patients have much progressively  increased depositions of both tau and A$\beta$. Although A$\beta$ seems to be deposited almost everywhere in the brain regions, tau deposits are more concentrated in the cortical regions. MMSE=Mini Mental State Examination.