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. 2017 Sep 5;9:32. doi: 10.1186/s11689-017-9212-y

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© The Author(s). 2017

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 2 — Mechanisms by which genetic influences that are non-specific to autism may compound autistic severity and incur “comorbid” affectation with non-ASD traits (ADHD as an example here). 1 Specific influences on ASD that simultaneously incur comorbidity traits that are part and parcel of the syndrome. 2 Amplification of ASD severity by a non-ASD-specific causal influence. ADHD attention-deficit/hyperactivity disorder, ASD autism spectrum disorder