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The study shows that in about 15 per cent of identical twins,
twin carried a "substantial"
of mutations that the other did not have. This
is important as it sheds light on the "nature
nurture" debate. This is whether human
is caused by socializing and upbringing, or by a person's
. The research shows that this tiny difference, and not environmental
, could be the reason for different behavioural
or medical conditions. A professor said a
mutation may be the source of a disease or
.