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KPC-positive K. pneumoniae strain wu15 (disk diffusion zone sizes of 8 mm and 12 mm for ETP and MEM, respectively). Rows show clone images at 90-min intervals after exposure to growth medium alone (top row), 16 μg/ml meropenem (MEM) (middle row), or 16 μg/ml meropenem plus 32 μg/ml of the inhibitor 3-nitrophenylboronic acid (MEM+NPBA) (bottom row). Images are zoomed in and contrast enhanced. Scale bar, 20 μm.
