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In page Causes of mental disorders:
"Research has shown that many conditions are polygenic meaning there are multiple defective genes rather than only one that is responsible for a disorder, and these genes may also be pleiotropic meaning that they cause multiple disorders, not just one.[2] Schizophrenia and Alzheimer's are both examples of hereditary mental disorders.[citation needed] When exonic genes encode for proteins, these proteins do not just affect one trait. The pathways that contribute to complex traits and phenotypes interact with multiple systems, even though proteins have specific functions.[3] brain plasticity (neuroplasticity) raises questions of whether some brain differences may be caused by mental illnesses or by pre-existing and then causing them.
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