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Micrographs of community samples from the HS reactor set. (A) Phase-contrast micrograph showing various distinct morphotypes, including spirals, short straight rods, curved rods, thin filaments, thick rods, single cocci, and an aggregate of pseudosarcina units. (B and C) Phase-contrast micrograph (B) and epifluorescence micrograph (C) of the same field of view, indicating that the aggregated pseudosarcina units and single short straight rods exhibit F420 autofluorescence. Bars = 10 μm.
