Intracellular alkane levels of ABC2 and ABC3. S. cerevisiae BY4741 with and without ABC2/3 were cultured under exposure to 0.5% (vol/vol) alkane or 20% (vol/vol) undecane. After 48 h incubation, intracellular alkane levels were measured as described under “Methods”. Intracellular alkane levels were normalized to that of control cells carrying an empty plasmid. Data shown are the mean ± SD of four biological replicates.