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Do we replace all our cells in nine years?

According to Bill Bryson, in his book ‘A Short History of Nearly Everything’, the human body replaces all its cells within 9 years, most of them within a month. So after nine years there isn’t one part of us alive that was nine years ago. If that is correct?
Roger Keith from Northamptonshire (Age 45-54)

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One Response

  1. No, afraid not. The lens of your eye contains cells older than you are. Although the lens epithelium may lose the odd cell, all of the fibre cells (the ‘clear’ ones that let the light through) are retained from their first differentiation in the early embryo until death and new cells are added throughout life.

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