Symposium Review:  Research on gene flow from transgenic plants marches on! For example, the North Central Weed Science Society hosted the second biannual symposium on gene flow on December 12 ? 13, 2007, in St. Louis, Missouri. Abstracts of the 38 oral presentations and posters are available at http://www.ncwss.org/. The meeting brought together academic, industry, government, and other interested scientists to discuss recent research on 1) within-species gene flow, 2) crop-wild hybridization and gene introgression, 3) consequences of gene flow, 4) approaches to managing gene flow, and 5) modeling gene flow. The organizing committee included Michael Horak (Monsanto Company; Committee Chair), David Gealy (USDA), Hector Quemada (Crop Technology Inc.), Neal Stewart (University of Tennessee), Mark Westgate (Iowa State University), and Allison Snow (Ohio State University). More than fifty people from at least six countries participated.