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Except where otherwise noted, this item's license is described as Copyright 2008 Dange et al. This article is distributed under the terms of an Attribution–Noncommercial–Share Alike–No Mirror Sites license for the first six months after the publication date (see <a href="http://www.jcb.org/misc/terms.shtml">http://www.jcb.org/misc/terms.shtml</a>). After six months it is available under a Creative Commons License (Attribution–Noncommercial–Share Alike 3.0 Unported license, as described at <a href="http://creativecommons.org/licenses/by-nc-sa/3.0/">http://creativecommons.org/licenses/by-nc-sa/3.0/</a>).