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2.7. Confocal Laser Scanning Microscopy (CLSM) The 72-h biofilms exposed to 50 µg/mL of ClyR or PBS for 5 min were also stained by LIVE/DEAD® Bac-LightTM Bacterial Viability kit L-7012 (Invitrogen, Carlsbad, CA, USA) for 15 min and washed twice with PBS. The stained biofilms ...