The center accepts donations from participants in its own longitudinal and clinical studies. Phenotypes collected include Alzheimer's disease, family history of Alzheimer's, cognitively normal, healthy normal, dementia with Lewy bodies, frontotemporal dementia, tauopathy, Parkinson's, vascular dementia, and mixed dementia cases. Tissue is collected from brain hemispheres, and is available frozen. Non-fasted CSF and some postmortem CSF, serum, and plasma are also available. Samples are available to researchers with a research protocol approved by the center's committee.