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RT-PCR analysis of β-actin, IL-13Rα1, and IL-4Rα gene expression in tissue cultures of primary normal (N), Th1-type (T1), and Th2-type (T2) fibroblast lines. Gene expression of IL-13Rα1 was constitutively expressed on all three fibroblast populations whereas IL-4Rα expression varied between normal, type 1, and type 2 fibroblast populations.
