Fig. (2) The hydrolysis rate of p-nitrophenyl laurate by LipA in the absence (●) and presence of 0.2% SDS (○). Assays were performed as described in the materials and methods section. Each assay contained 10 µg of freshly purified LipA. The assay duration was 15 min, at the end of the assay; reactions were stopped in ice. Since LipA and LipB look very much the same, LipB was omitted for clarity.