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Figure 2. Diagram of known and suspended mechanical clearance pathways for insoluble particles depositing in the pulmonary region (McCellan et al 1998)

Diagram of known and suspended mechanical clearance pathways for insoluble particles depositing in the pulmonary region

Source: SCENIHR  The appropriateness of existing methodologies to assess the potential risks associated with engineered and adventitious products of nanotechnologies (2006),
3.8.2 Inhaled Particles, p. 26