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Neurosci. 6:115. doi: 10.3389/fnins.2012.00115 This article was submitted to Frontiers in Neurogenomics, a specialty of Frontiers in Neuroscience. Copyright © 2012 Kohannim, Hibar , Stein, Jahanshad, Hua, Rajagopalan, Toga, Jack, Weiner , de Zubicaray, McMa- hon, Hansell, Martin, Wright , Thomp- son and The Alzheimer’s Disease Neu- roimaging Initiative. This is an open- access article distributed under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in other forums, pro- vided the original authors and source are credited and subject to any copy- right notices concerning any third-party graphics etc. www.frontiersin.org August 2012 | Volume 6 | Article 115 | 13