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Light micrographs of sunflower roots colonized with R. irregularis displaying typical mycorrhizal structures (at 28 dpi), control plant (a), and R. irregularis-colonized plant (b–f), where, Hr = host root, Ih = interaradical hyphae, Eh = exteraradical hyphae, Sp = spore, Sc = sporocarp, Ve = vesicle, and Ar = arbuscule.
