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Cells were incubate for 90min with THPTS and either kept in the dark (A, B) or irradiated (C, D) at 760nm. Healthy bacteria were seen in green whereas dying bacteria were also stained with propidium iodie and appeared therefore in yellow. Dying bacteria could be observed in control panels (arrows in B) but no healthy bacteria were seen in irradiated panel (C and D). Scale bar 40µm in A and C, 10µm in B and D.
