Genetic and Physical Localization of the Soybean Rpg1-b Disease Resistance Gene Reveals a Complex Locus Containing Several Tightly Linked Families of NBS-LRR Genes oleh Tom Ashfield, Anna Bocian, Dan Held, Adam D. Henk, Laura Fredrick Marek, Dariush Danesh, Silvia Peñuela, Khalid Meksem, David A. Lightfoot, Nevin D. Young, Randy C. Shoemaker, Roger W. Innes