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Microscopy view of the co-culture with C. ljungdahlii and C. kluyveri. We used a phase-contrast microscope to periodically check the appearance of the co-culture. Black arrows point to cells of one morphology (thicker cells), while red arrows point to cells of another morphology (thinner cells). We observed this difference throughout the co-culture reactor run. However, it was not possible for us to clearly differentiate between C. ljungdahlii and C. kluyveri by light microscopy.
