Fig. 1
From: Usefulness of myeloperoxidase as a biomarker for the ranking of pulmonary toxicity of nanomaterials
Concentration of MPO in BALF exposed to inhaled chemicals. a 0.2 mg exposed chemicals following intratracheal instillation. b 0.4–1.0 mg exposed chemicals following intratracheal instillation. c all of the exposed groups following inhalation. Error bar means standard deviation. Asterisks indicate significant differences compared with each control (Mann-Whitney U test) (*p < 0.05, **p < 0.01)