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Concentrations of whole-cell, procaterol-induced cyclic adenosine monophosphate (cAMP) in primary murine tracheal epithelial cells exposed to the indicated concentrations of polycyclic aromatic hydrocarbons (PAHs) in DMSO or DMSO-only vehicle in complete medium for 24 hours (n = 6 filters/condition). *P < 0.001, versus all other groups.
