The National Institutes of Health (NIH) is offering a funding opportunity titled “Ancillary Studies to Ongoing Clinical Projects (R21 Clinical Trial Not Allowed)” aimed at supporting time-sensitive ancillary studies that leverage resources from active clinical projects related to the mission of the National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS). Eligible applicants include a diverse range of institutions such as higher education entities, nonprofits, for-profit organizations, and government agencies, with a funding limit of $400,000 over a two-year period. This initiative emphasizes innovative research that enhances the understanding of diseases while ensuring that ancillary studies do not disrupt parent projects, encouraging interdisciplinary collaboration. Interested applicants should note that the application deadline is December 5, 2025, and can find more information by contacting NIH Grants Information at grantsinfo@nih.gov or visiting the opportunity's webpage at https://grants.nih.gov/grants/guide/pa-files/PAR-23-026.html.