Fig. 3From: Evaluation of immunological, inflammatory, and oxidative stress biomarkers in gasoline station attendantsOxidative stress biomarkers in GSA group (n = 38) and non-exposed group (n = 28). a Protein carbonyl (PCO) levels. b Glutathione S-transferase (GST) activity. Data are expressed as mean ± SEM. *p < 0.001. **p < 0.05Back to article page