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Mean ± SD assessed via a resampling procedure of R1air (a), R1O2 (b), ΔR1 (c), ΔR2* (d) determined in 20 bins based on density (S0air) for control (open squares), and PPE-challenged (filled squares) animals. Bins for which a test of equal mean showed p-values lower than 0.1 are indicated with a circle.
