The National Institutes of Health (NIH) is announcing an upcoming funding opportunity titled "Ancillary Studies to Ongoing Clinical Projects (R21 Clinical Trial Not Allowed)," aimed at supporting research that leverages resources from ongoing clinical studies. This initiative encourages applications for ancillary studies that utilize well-characterized patient cohorts, infrastructure, data, and biological samples, while aligning with the mission of the National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS). With an estimated total program funding of $600,000 and the expectation of awarding two grants, potential applicants are advised to begin developing collaborations and project proposals in advance of the official solicitation, which is expected to be published in early 2026. For further inquiries, interested parties may contact Dr. Heiyoung Park at Heiyoung.Park@nih.gov or by phone at 301-594-5032.