For more than a century, researchers have had a deeply-held belief that schizophrenia is one form of mental illness that has its basis in genetics. In the intervening years, hundreds of millions of person-hours and billions of dollars have been funneled pursuing the genetic theory of schizophrenia.
Despite all of this enormous effort, researchers are starting to understand that perhaps the genetic component of schizophrenia has been overemphasized. And, in fact, the heritability estimates are not the 80-85 percent that some researchers claimed, but instead are far less.
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