Medical illustration of 12 stem cells against a red background. Two of the stem cells appear larger in the foreground of the image and are in focus, while the others are blurred, along with the background. The stem cells appear like silver blobs with a red circular center .
Scientists reversed some signs of immune aging in mice with a new treatment that could one day potentially be used in humans.
The new immunotherapy works by disrupting a natural process by which the immune system becomes biased towards making one type of cell as it ages.
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