Differences between human twins at birth highlight importance of intrauterine environment

Differences between human twins at birth highlight importance of intrauterine environment: Your genes determine much about you, but environment can have a strong influence on your genes even before birth, with consequences that can last a lifetime. Scientists have for the first time shown that the environment experienced in the womb defines the newborn epigenetic profile, the chemical modifications to DNA we are born with, that could have implications for disease risk later in life.