Fig. 5From: Comparison of methods for the analysis of airway macrophage particulate load from induced sputum, a potential biomarker of air pollution exposureAirway macrophage heterogeneity. The morphology of the airway macrophages (shown with red arrows) was varied within the same sample (a) and between different participant samples (a & b). The particulate load also varied between macrophages in the same sample (a)Back to article page