The National Institutes of Health (NIH) is offering a funding opportunity titled "Access and Manipulation of Brain Cell Subtypes Implicated in Aging and Alzheimer's Disease/AD-Related Dementias (ADRD)." This initiative invites applications that propose innovative strategies to target and manipulate specific brain cell subtypes associated with aging and ADRDs, utilizing advanced techniques such as adeno-associated virus (AAV) capsid engineering. The funding aims to support research that enhances understanding of neurodegeneration mechanisms, with a total funding availability of approximately $6 million over a maximum project duration of 5 years, divided into two phases: R61 for preliminary activities lasting up to 2 years and R33 for implementation and hypothesis testing lasting up to 3 years. Interested applicants must submit their proposals by October 7, 2024, and can direct inquiries to NIH Grants Information at grantsinfo@nih.gov or visit the opportunity's webpage for further details at https://grants.nih.gov/grants/guide/rfa-files/RFA-AG-25-024.html.