Third, researchers have focused on so-called gene-environment interactions, reasoning that some exposures that have relatively weak associations with breast cancer in the general population may have a much stronger effect in subgroups with a specific genetic make-up.

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Like living organisms they depend heavily on the interactions of their environment for nourishment, growth and even survival.

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First of all, the brain is a complex system that develops, in a very large part, through its interactions with the environment.

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