Fig. 2
From: Personal exposure to air pollutants and immune system biomarkers in pregnant women

Pairwise Pearson’s correlations between air pollutants (a). Pairwise Pearson’s correlations between cytokines (imputed, corrected and log-10 transformed) and number of leukocytes (b). The Pearson correlation coefficients are indicated using a scale of size and color only when the p-values were less than 0.05. Abbreviations: PM2.5 particulate matter with diameter ≤ 2.5 μm; NO2 nitrogen dioxide; OP: oxidative potential; DTT: dithiothreitol; AA: ascorbic acid; IL interleukin; IFN interferon; TNF tumor necrosis factor; RANTES regulated on activation, normal T cell expressed and secreted; MCP monocyte chemoattractant protein; PHA phytohemagglutinin; R848 resiquimod