Degradation of intracellular wax esters in the wild-type and ald1Δ strains. The cells, which were grown on a nitrogen-limiting medium containing 0.5% (vol/vol) n-hexadecane, were shifted to a salt medium without a carbon source, and then the amount of intracellular wax esters was measured at intervals. Solid bars, wild-type strain; open bars, ald1Δ strain.