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needle with spindle and egg

BATTERY SWAP A technique to suck a chromosome-containing structure called the spindle (white, in needle) out of a mother’s egg and place it in a donor egg emptied of its chromosomes but with healthy mitochondria can help prevent mitochondrial diseases.

mouse hippocampus

FADING YOUTH  Young blood doesn’t kick-start nerve cell division (red cells, left image) in the hippocampus of an old mouse (second from right). And factors in old blood interfere with the process in the brain of a young mouse (second from left).

illustration of DNA

A study of genetic data from 36,000 people with autoimmune diseases shows that dialing down a protein's activity — but not knocking it completely out — may provide a new way to calm overactive immune systems without raising the risk of getting infections.

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