Effect of AC-PACs on C. albicans biofilm formation. Panel A: C. albicans biofilms were quantified by staining with crystal violet. Assays were done in triplicate and the means ± SD from three independent experiments were calculated. A value of 100% was assigned to the biofilm formed in the absence of AC-PACs. *, significantly lower than the value for the untreated control (P < 0.05). Panels B and C: Phase contrast microscopy of biofilms formed in the presence (B) or absence (C) of AC-PACs (25 μg/ml).