The National Institutes of Health (NIH) is offering a funding opportunity through the Ancillary Studies to Ongoing Clinical Projects (R21 Clinical Trial Not Allowed) grant, aimed at facilitating time-sensitive ancillary studies related to ongoing clinical projects under the National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS). This initiative allows applicants to explore new research questions not addressed in parent studies, utilizing existing resources and patient cohorts to enhance scientific understanding and potentially improve diagnostics and treatments for diseases within the NIAMS portfolio. Eligible applicants include higher education institutions, nonprofits, and government agencies, with a funding ceiling of $250,000 per year and a total request limit of $400,000 over two years. Applications are due by December 5, 2025, and interested parties can reach out to NIH Grants Information at grantsinfo@nih.gov for further inquiries.