Effect of farnesol on P. brasiliensis morphogenesis. P. brasiliensis yeast cells were grown for 24 h and 48 h at 25°C on different concentrations of farnesol. (A) Morphology of P. brasiliensis cells assessed by light microscopy after incubation with farnesol. (B) Percentage of cells showing germ tubes after 24 h and 48 h of cultivation in the absence, or in the presence of farnesol at different final concentrations. (C) Average size of the germ tubes formed in different concentrations of farnesol. Bars represent standard errors and different letters point to statistical relevance, P ≤ 0.001.