Figure 5From: Distribution and persistence of pleural penetrations by multi-walled carbon nanotubesMorphometric determination of the number of alveolar epithelial penetrations versus dose 56 days after aspiration. The number of MWCNT penetrations per lung versus aspiration dose of MWCNT demonstrated a sigmoidal dose-response with an ED50 of 15.3 μg. (Mean ± SE, N = 8).Back to article page