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Microscopic observations of the change in cell shape of P. oleovorans GPo1 (A to D) and GPo500 (E to H). Growing cells before microcosm inoculation (A and E) and cells after 3 (B and F), 10 (C and G), and 21 (D and H) days of microcosm residence are shown. Magnification, ×1,000.