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Genes and aggression

Scientists have identified several different brain chemicals that affect your mood. Some people may inherit variants of genes that alter the levels of these chemicals, which could make them more easily annoyed. But so far, scientists have identified just one family in the entire world who have a gene variant that seems to be associated with aggressive behaviour.

Several different brain chemicals affect your mood.
Several different brain chemicals affect your mood.
National Medical Slide Bank/Wellcome Photo Library

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