<a href="http://www.nature.com/nbt/journal/v19/n9/suppinfo/nbt0901-813_S1.html" target="_blank">http://www.nature.com/nbt/journal/v19/n9/suppinfo/nbt0901-813_S1.html</a> dig around abit there is a corresponding article which is very helpful. i dont think you need anything more than a registration to get this stuff