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(A) Transmission electron micrograph of D. putei cells at the end of exponential-phase growth (at 192 h) showing large healthy cells, one dividing cell, and a few smaller-diameter and denser cells. (B) Transmission electron micrograph of D. putei cells during maintenance metabolism (at 640 h) showing more smaller-diameter and denser cells, one larger cell, a couple of spores with spore coats, and remnants of cell walls and membranes.
