Neighbor-joining phylogenetic tree of nucleotide-binding leucine-rich repeat (NB-LRR) genes. The tree was constructed using only the nucleotide-binding (NB) sequences. The NB sequence of NB-LRR proteins near or cosegregating with the Rsv3 locus, the hit sequences and their close relatives retrieved from BLASTP searches against the 1600 NB sequences collected by McHale et al. (2006) with the NB-LRR proteins in the vicinity of the Rsv3 locus, and the full-length-cloned soybean coiled-coil nucleotide-binding leucine-rich repeat (CC-NB-LRR) proteins (3 gG2, 5 gG3, 6 gG9, Rpg1-b, Rps1-k-1, and Rps1-k-2) were used to construct a gene tree. The designations of sequences except the soybean sequences are as used by McHale et al. (2006). The soybean sequences are in bold. The tree was rooted using human APAF1 protein. The scale bar represents five amino acid differences. The boxed regions represent two soybean CC-NB-LRR subclades GmCC-NB I and GmCC-NB II. Medic sati, Medicago sativa L.; Theob caca, Theobroma cacao L.; Citru sine, Citrus sinensis (L.) Osbeck; Gossy barb, Gossypium barbadense L.; Pisum sati, Pisum sativum L.; Ponci trif, Citrus trifoliata L.; Solan phur, Solanum phureja × Solanum stenotomum; Glyci max, Glycine max (L.) Merr.; Homo sapi, Homo sapiens.