Figure 2: Blood lead levels (BLL) correlations with δ-ALAD and NAG. The BLL of monocasters was significantly correlated inversely with δ-ALAD activity (A) and positively with NAG activity (B). ALAD, amino levulunic acid dehydratase; NAG, N-acetyl-3-D-glucosaminidase. *Indicates a significant correlation at P <0.001. Source: Reproduced with permission from Ref. 8.