Figure 1: Photomicrographs of sputum samples of As-exposed women showing neutrophilia (a), eosinophilia (b), accumulation of alveolar macrophages (c) and lymphocytes (d), suggesting inflammation. Compared with control, the sputa of As-exposed women had 28% more neutrophils, 84% excess lymphocytes, 1.9-times more alveolar macrophages and 5-times more eosinophils. Pap-stained, original magnification 1000x.