In One Experimental Study, Researchers Found That Newborn Rats Who

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In one experimental study, researchers found that newborn rats who were genetically predisposed to be calm and stress-resistant grew up to be nervous, high-strung, and easily stressed adult rats when raised by genetically unrelated, inattentive mothers. The explanation for these results was that epigenetic changes had taken place which changed their brain chemistry and literally "reprogrammed" their behavior.