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Disclaimer: Supplementary materials have been peer-reviewed but not copyedited. S.1. Detailed Response to Barnes et al.'s Methodological Defense of Twin Studies S.2. More Detail: GCTAs and Social Phenotypes: Let's Call The Whole Thing Off S.3. Heritability Studies Lack Utility Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.
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Burt et al. (2015) studied this question.
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