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Cytokine profiles across compartments in nonsmokers, representing baseline cytokine signatures that exist in the absence of tobacco product use exposures. Experimentally measured cytokine concentrations are plotted, with average levels as the lines and standard deviations as the shaded region, by compartment. Cytokines are ordered from those with the highest (left) to lowest (right) average concentration in NLF samples. NLF, nasal lavage fluid.
