The Department of Health and Human Services, specifically the National Institutes of Health, is seeking proposals for the clinical validation of a candidate biomarker for neurological or neuromuscular disorders. Biomarkers are indicators of biological processes or responses and are crucial for the development of therapeutics and clinical decision-making. This solicitation aims to advance the validation of biomarkers for neurological and neuromuscular disorders through rigorous clinical validation of the biomarker detection method. The research should focus on one or two specified contexts of use and include evidence of preliminary testing and development of the detection method. The funding opportunity uses a cooperative agreement, milestone-driven mechanism, and supports the optimization and standardization of the detection method. The research should also include a clear study design, statistical design, and a feasible timeline with quantitative annual milestones. Collaboration among scientific investigators, clinical scientists, and other experts is encouraged. The funding opportunity is open until June 23, 2026. For more information, visit the solicitation agency URL: link.