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Optical microscopy images of hand sections of nodules from plants inoculated with the wild-type strain (A) or the hfq mutant (B) containing the plasmid pGus2 carrying the nfeB::uidA fusion (SmblK7 or SmblK8, respectively). Expression of this fusion is revealed by the blue staining in nodule zone III in the wild-type strain and in different zones of a nodule in the hfq mutant (SmblK8), which, although colonized, fails to elongate (arrows).
