The National Institutes of Health (NIH) is offering a funding opportunity for the analytical validation of candidate biomarkers for neurological and neuromuscular disorders through the U44 Clinical Trial Optional Cooperative Agreement mechanism. This initiative aims to support the rigorous validation of analytical methods for biomarker measurements, ensuring compliance with FDA guidelines and addressing critical needs in clinical research. Eligible applicants include U.S. small businesses, with funding amounts of up to $700,000 for Phase I and $1.5 million for Phase II over a maximum of four years. Applications will open on February 22, 2024, and must be submitted by June 25, 2026; for further inquiries, interested parties can contact NIH Grants Information at grantsinfo@nih.gov.