. Author manuscript; available in PMC: 2015 Dec 1.
Published in final edited form as: Genes Immun. 2015 Mar 12;16(4):239–246. doi: 10.1038/gene.2015.3
Users may view, print, copy, and download text and data-mine the content in such documents, for the purposes of academic research, subject always to the full Conditions of use:http://www.nature.com/authors/editorial_policies/license.html#terms