How kind you are could be affected by a change in a single gene. What's more, others can tell if you have the gene even if you don't speak a single word.
There are several variations of the gene that codes for the receptor for the hormone oxytocin.Aleksandr Kogan at the University of Toronto, Canada, and colleagues wanted to check whether these variations influence behaviour, since high levels of oxytocin are believed to make people more sociable.
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