The center collects, stores, and distributes pre- and postmortem tissues including brain, spinal cord, CSF, serum, blood cells, and urine. The center maintains inventories of its tissue and fluid samples and makes them available for scientists without a clinical site. The center has no donor age limit, but does not accept brain tissue from people with tuberculosis, Creutzfeldt-Jakob disease, or people who were on a respirator before death.