Traumwind - Even thoughts can turn genes 'on' and 'off'

But identical twins, who have the same genes, don't have identical traits: One twin might be schizophrenic and the other not, one might be shy and the other outgoing, one might get a "gene-based" cancer and the other not. The difference between identical twins is the experiences they have and, if I may speculate, which of their genes are expressed.

This past April, in one of their coolest uses so far, gene chips showed that the difference between human brains and chimp brains is not which genes each brain has. Those are nearly identical. The difference is which genes are turned on and which are switched off.
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