Figure 5From: Investigating the immunomodulatory nature of zinc oxide nanoparticles at sub-cytotoxic levels in vitro and after intranasal instillation in vivo H&E staining of lung sections of mice treated with (A) vehicle control, (B) LPS, (C) pristine 30Â nm ZnO NPs and (D) surfactant-dispersed 30Â nm ZnO NPs via intratracheal instillation. AV indicates the alveolar region of the lung. Red arrows indicate haemorrhage and black arrows demonstrate thickened bronchial walls.Back to article page