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Environment steers immune system: genes play lesser role in influencing variations in immunity.
Environmental factors shape the immune system's reactions more than genes do, a study of twins suggests. As people age, the effect of the environment on their immune systems grows even stronger, researchers report in the Jan. 15 Cell.
In the study, 58 percent of the variation measured in immune system responses was almost completely determined by nonheritable factors, such as exposure to microbes.
The study may improve understanding of how genes and the environment interact, and...
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