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. 2022 Jan 10;96(3):691–710. doi: 10.1007/s00204-021-03212-y

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Fig. 4 — A hierarchical and entangled structure of human lung alveolus (Huh et al. 2012); B the air–liquid interface model based on a PDMS chamber (Huh et al. 2012); C genuine recapitulation of the complexed alveolus microstructure by photo-absorbent-assisted stereolithography (Grigoryan et al. 2019)