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Prazosin decreased the production of C. violaceum QS-controlled pigment. (A) A white (creamy) zone was formed around the well containing prazosin at sub-MIC, that indicates anti-QS activity. (B) The DMSO extracted violacein was quantified in the cultures treated or not with prazosin at sub-MIC. Prazosin significantly diminished the violacein (***: p ≤ 0.001).
