The center accepts donations from residents of the Greater San Diego area. Some antemortem information is strongly preferred. Participants must be at least 18. The center focuses on HIV, but other neurologic conditions are not exclusionary. It collects whole brain and spinal cord, as well as limited systemic tissues. Samples are fixed, frozen, and paraffin-embedded. Samples include antemortem plasma, CSF, and PBMCs, as well as postmortem serum and non-fasting CSF. Requests can be submitted through the National NeuroAIDS Tissue Consortium. Disbursements may be limited based on feasibility and qualifications. More information NNTC website.