Nodulin Gene Expression and ENOD2 Localization in Effective, Nitrogen-Fixing and Ineffective, Bacteria-Free Nodules of Alfalfa.
C. Van De Wiel, J. H. Norris, B. Bochenek, R. Dickstein, T. Bisseling, and A. M. Hirsch
Plant Cell. 1990 October; 2(10): 1009–1017. doi: 10.1105/tpc.2.10.1009.PMCID: PMC159949