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Relative expression of Notch ligands, receptors, and downstream effectors in the small airway epithelium of normal nonsmokers (n = 12). TaqMan quantitative real-time reverse transcriptase polymerase chain reaction was used to generate relative expression data for Notch-related ligands, receptors, and downstream effector genes. Each bar represents the mean expression level ± standard error for the gene in nonsmokers small airway epithelium.
