Registration and abstracts for poster presentations are still open for the 2009 International Congress on Symbiosis. The International Symbiosis Society and the University ofWisconsin-Madison Symbiosis Cluster invite you to join us for the 2009 International Congress on Symbiosis August 9-15, 2009. The conference at the UW-Madison will feature oral sessions and posters spanning the latest research in the field of symbiosis. Sessions are organized conceptually, spanning the molecular mechanisms of symbiosis to the role of symbiosis in ecosystem function.