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EPR spectrum of intact soybean nodules showing three types of features. These correspond to the signals of rhombic non-heme Fe3+ (g=4.3), Mn2+ (six equally spaced lines centered at g=2.0), and organic free radicals (intense narrow signal at g=2.0). The Lb2+NO signal, if present, appears superimposed on these features (see text for details).
