Assertion: nodule | /r/HasAspect | 75% less n 2 fixation
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Source sentences:
text: As for the second enzyme of the pathway, the S. meliloti mutants (gshB) formed nodules having 75% less N 2 fixation (Harrison et al., 2005) and those of Rhizobium tropici formed nodules that displayed early senescence (Muglia et al., 2008).