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Bacterial alpha diversity analysis of exposure and diet groups. Alpha diversity analysis using (A) Shannon index (diversity) and (B) Chao1 index (richness) compared in C57Bl/6 mice placed either on regular chow (LF) or a high-fat (HF) diet and exposed to either filtered air (FA) or whole-body inhalation to a mixture of gasoline and diesel engine exhaust (ME: 30 μg PM/m3 gasoline engine emissions + 70 μg PM/m3 diesel engine) for 6 h/d, 7 d/wk for a period of 30 days.
