Lodwig EM, Hosie AHF, Bourd^ s A, Findlay K, Allaway D, Kar R, Downie JA, Poole PS. 2003. Amino acid cycling drives nitrog fixation in the legame-Rhizobium symbiosis. Nature 422: 722-7 Oldroyd GED, Downie JA. 2008. Coordinating nodule morphogen rhizobial infection in legumes. Annual Review of Plant Biology 59 Ooki Y, Banba M, Yano K, Maruya J, Sato S, Tabata S, Saeki K, M, Kawaguschi M, Izui K et al. 2005. Characterization of the Lo japonicus symbiotic mutant loti that shows a reduced nodule nu distorted trichomes. Plant Physiology 137: 1261-1271. Ramirez M, Graham MA, Bianco-Lopez L, Silvente S, Medrano-Blair MW, Hernandez G, Vance CP, Lara M. 2005. Sequencing analysis of common bean ESTs. Building a foundation for funct genomics. Plant Physiology 137: 1211-1227. Sprent JI. 2001. Nodulation in legumes. London, UK: Royal Botanic G Sprent JI. 2003. Mutual sanctions. Nature 422: 672-674. Sprent JI. 2007. Evolving ideas of legume evolution and diversity: a perspective on the occurrence of nodulation. New Phytologist 174: Terpolilli JJ, O'Hara GW, Tiwari RP, Dilworth MJ, Howieson JG The model legume Medicago truncatula A17 is poorly matche N2 fixation with the sequenced microsymbiont Sinorhizobium m 1021. New Phytologist 179: 62-66.