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Effect of methanolic extract of I. verum and its constituent compound 3-HBA on TDB agar (supplemented with skimmed milk and bromocresol green) proteolytic activity of S. aureus. (A) Untreated control S. aureus, (B) treated (methanol extract of I. verum) strain of S. aureus showing no zone of clearance, and (C) 3-HBA-treated S. aureus showing no proteolytic activity.
