Results from analysis of BAL fluid after sub-acute exposure to Ag nanoparticles (n = 5 per each group). Data from Ref. 34 for Cu nanoparticle exposure (n = 6 per control group, n = 8 per Cu-exposed group) using the same protocol are shown for comparison. Number and percentages of differential cells in BAL, * p < 0.05 and ** p < 0.01 (A). Percent change from control animals in total cells, total protein and activity of LDH (B). Data are expressed as mean ± SE.