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Markers of injury to the alveolar epithelium: surfactant proteins SP-A (A) and SP-D (B). The rats were exposed for 1, 4, 8, 15, and 30-days to air or ABS emissions (240 μg/m3) and euthanized at 24 h post last exposure. Values represents means ± SEMs; N = 8/group/time point.
