Summary:

- The article discusses a new set of viral tools developed by researchers that can target and manipulate almost any cell type in the brain. This is a significant advancement in neuroscience research, as it allows for more precise and targeted studies of brain function and behavior.

- The viral tools, called AAVs (adeno-associated viruses), can be engineered to selectively infect different types of neurons, glial cells, and other cell populations in the brain. This provides researchers with a powerful tool to study the role of specific cell types in various neurological processes and disorders.

- The expanded set of AAV tools offers greater flexibility and precision in brain research, enabling scientists to better understand the complex neural circuits and cell-specific mechanisms underlying brain function, development, and disease. This has important implications for advancing our knowledge of the brain and developing targeted therapies for neurological conditions.