. 2008 Feb 12;4:164. doi: 10.1038/msb.2008.5
Copyright © 2008, EMBO and Nature Publishing Group
This is an open-access article distributed under the terms of the Creative Commons Attribution Licence, which permits distribution and reproduction in any medium, provided the original author and source are credited. Creation of derivative works is permitted but the resulting work may be distributed only under the same or similar licence to this one. This licence does not permit commercial exploitation without specific permission.