The National Institutes of Health (NIH) is offering a grant opportunity titled "Microglial Pathophysiology in Comorbid Substance Use Disorder (SUD) and HIV (R61/R33 Clinical Trial Not Allowed)" aimed at exploring the molecular mechanisms by which HIV-infected microglia contribute to neuropathologies associated with co-occurring HIV and SUD. This initiative seeks to generate specific microglial protein profiles and interaction networks to better understand the impact of these conditions on brain function, utilizing a two-phased approach that includes both preliminary and extended analyses. A total funding amount of $2.5 million is available for 3-6 awards, with proposals due by August 15, 2025. Interested applicants can find more information and submit inquiries via email at grantsinfo@nih.gov or visit the official announcement at https://grants.nih.gov/grants/guide/rfa-files/RFA-DA-25-014.html.