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Activity of the different ethanolic extracts of propolis (European and red and green Brazilian (Braz.)) on colony forming units (cfu; (A,B)), metabolic activity (C,D) and quantity (E,F) in a formed cariogenic biofilm after 4 h (A,C,E) and 24 h (B,D,F). */** p < 0.05/p < 0.01 vs. control 0.9% NaCl.
