The National Institutes of Health (NIH) has announced a funding opportunity for the development and application of positron emission tomography (PET) and single photon emission computed tomography (SPECT) imaging ligands as biomarkers for Central Nervous System (CNS) disorders. This initiative aims to enhance research on human brain disorders by inviting applications for research grants that propose the development and evaluation of novel radioligands, with a focus on facilitating drug discovery and understanding disease mechanisms. The program emphasizes collaboration among academia and the pharmaceutical industry to create functional imaging tools necessary for clinical trials and biomarker development. Interested applicants, including a diverse range of educational and research institutions, nonprofits, and for-profit organizations, must submit their proposals by May 7, 2026. For further inquiries, applicants can contact NIH Grants Information at grantsinfo@nih.gov or visit the additional information link at https://grants.nih.gov/grants/guide/pa-files/PAR-23-164.html.