Figure 2. Dose–response curves used for determining IC50 values of (R)-6 and (S)-6 for wild- type hAChE and mAChE (with the mAChE concentration adjusted to a lower maximum activity than the hAChE concentration, for clarity). The enzymatic activity is measured as the increase in absorbance (ΔA) at 412 nm over time as a result of the enzymatic hydrolysis of acetylthiocholine.[3] Means ÆS. D. from triplicate dose response curves (goodness of fit, ...