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Phase-contrast light microscopy of R. johrii and S. marcescens cells. (A) Two-day-old R. johrii cells lack phase-bright objects. (B) Seven-day-old R. johrii cells show phase-bright objects (black arrows). (C) Seven-day-old S. marcescens cells lack phase-bright objects. (D) After 65 days, S. marcescens cells show two kinds of cell morphologies: phase-bright (black arrows) and ghost cells (white arrows). Scale bar, 10 μm.
