The National Institutes of Health (NIH) is preparing to publish a Notice of Funding Opportunity (NOFO) aimed at supporting the discovery of in vivo chemical probes for the nervous system, specifically targeting novel brain mechanisms. This initiative, led by the National Institute on Aging (NIA) in collaboration with the National Eye Institute (NEI), the National Institute on Drug Abuse (NIDA), and the National Institute of Mental Health (NIMH), seeks applicants who possess validated starting compounds for chemical optimization and bioassays to explore new analog compounds. The focus will be on developing small molecules that can enhance understanding of biological processes relevant to brain diseases, with an emphasis on innovative biological targets. Interested applicants can reach out to Dr. Paul G. Grothaus at grothausp@mail.nih.gov or call 240-688-6634 for further information, with the estimated synopsis posting date set for February 26, 2026, and a projected award date of April 5, 2027.