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* Cognitive impairments<ref name="Roth"/>
====Heritability====
There is a great deal of evidence to show that schizophrenia is a heritable disease.
The fact that even monozygotic twins don't share a 100% [[concordance|concordance]] rate suggests environmental factors play a role in the vulnerability and development of the disorder. There are various environmental factors that have been suggested in various studies, including the use of marijuana, complications during pregnancy, socioeconomic status and environment, and maternal malnutrition. As the field of epigenetics advances, these and other external risk factors are likely to be considered in epidemiological studies <ref name="Roth"/>.
====Genetics====
Several genes have been identified as important in the study of schizophrenia, but there are a few that have special roles when studying the epigenetic modifications of the disease.
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