The Surprising Role of Mouse Brain Cells in Keeping Scent Maps Stable

Imagine the mouse's brain as a complex city map, where different areas represent different smells. This map is created and maintained by special brain cells called projection neurons. When these cells are removed, the map starts to change, even though the mice can still smell things. In the mouse's brain, there are specific cells called mitral and tufted cells (M/Ts) that send signals about smells to the brain. Scientists found that if these cells are removed when mice are young, the brain's smell map changes drastically. Even with very few of these cells left, the mice can still smell, but the map in their brain becomes messy.

Interestingly, when these cells are removed in adult mice, the same thing happens. The smell map in their brain changes, but they can still smell. This shows that while the brain can create the smell map without many of these cells, it needs them to keep the map stable as the mouse grows older.

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