Fig. 8

Cytokine levels in bronchoalveolar lavage fluid in Sprague Dawley and Brown Norway rats as a function of deposited lung dose of silver nanoparticles. Data shown as mean ± SD (n = 8–12 rats per group). *P < 0.05, **P < 0.01, ***P < 0.001 versus the air only control (0) within each time-point