Home/ < Back To Researchers/PD BRAC Cohorts PD BRAC Cohorts The PDBP BRAC is responsible for reviewing all requests for biospecimen access for PDBP as well as other cohorts. NINDS Biorepositories The Michael J. Fox Foundation Supported Cohorts The Harvard Biomarker Study Biospecimen Availability Overview The table below provides an overview of what types of biospecimens are available in each cohort study. Cohort Population Research Intent DNA RNA CSF Whole Blood Plasma Serum iPSCs NINDS Parkinson's disease Biomarkers Program (PDBP) Early to advance PD and controls 24-Hour Biofluid Sampling Early to moderate PD and controls Biomarker discovery BioFind Moderate to advanced PD and controls Biomarker discovery DATATOP Early, unmedicated PD Biomark discovery and validation Harvard Biomarker Study >600 early-stage, medicated and unmedicated cases with PD, >600 individuals with congnitive impairment, and >700 controls Discovery and validation of cross-sectional and longitudinal biomarkers for PD and AD LRRK2 Cohort Biomarker discovery Biomarker discovery Interested in obtaining biosamples? All investigators interested in obtaining biosamples must submit an online application for approval. All applications are submitted to the PD BRAC for review. Upon approval, an investigator is able to obtain biosamples.