The National Institutes of Health (NIH) is offering a funding opportunity titled "Cellular and Molecular Biology of Complex Brain Disorders (R21 Clinical Trial Not Allowed)" aimed at advancing research on high-confidence risk factors associated with complex brain disorders such as schizophrenia and bipolar disorder. This grant encourages exploratory research focused on understanding the intracellular, transcellular, and circuit-level mechanisms of neural function, rather than modeling the disorders themselves. Eligible applicants, including various academic institutions and community organizations, can apply for up to $275,000 over a two-year period, with applications due by September 7, 2026. For further inquiries, interested parties 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-24-025.html.