Many Men Lose Y Chromosomes as They Age. Now We May Know Why It's So Deadly

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Errors in the human genome are a part of life. As we age and DNA replicates, small mistakes creep into our genes – a misplaced letter here or some erroneous repetition there – that can accumulate over time to create a 'mosaic' of cells with unique codes throughout the body. Some cells can even wind up losing whole chromosomes. One example of this is a condition whereby white blood cells are m...

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