Almost all healthy people harbor patches of mutated cells
Tissues exposed to the environment such as skin have more mutations, a study finds
![gene mutations](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2019/06/060519_ts_mutations_feat.jpg?fit=860%2C460&ssl=1)
SUNNY SABOTAGE Exposure to sun, smoke, pollution and other environmental factors leads to more patches of mutated cells in healthy people’s skin, esophagus and lungs, a new study finds.
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