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Scheme of the main changes in metabolites and transcripts profile in P. vulgaris root nodules infected by a rpoN mutant, compared to wild-type nodules. Metabolites and reactions down- and up-regulated in nodules induced by the rpoN mutant are indicated in blue and green, respectively. Glu: glutamate; Gln: glutamine; OAA: oxaloacetate; Trp: tryptophan; Ala: alanine; Pyr: pyruvate; Arg: arginine; RND: resistance-nodulation-division; PG: peptidoglycan.
