Figure 8.

Scanning electron micrograph image of chest wall from a normal rat showing the parietal pleural surface with mesothelial cells (M) and a stoma (white arrows, St) that is approximately 3 μm in diameter.

Donaldson et al. Particle and Fibre Toxicology 2010 7:5   doi:10.1186/1743-8977-7-5
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