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IL-7 inhibits TGF-β–induced collagen synthesis in PFF. PFF (n = 3) and NF (n = 4) were cultured in medium alone, medium containing TGF-β1, or the combination of TGF-β1 plus IL-7 for 24 hours. The collagen content from the cell lysates was determined. IL-7 inhibits TGF-β–induced collagen synthesis in primary PFF but not in NF. *P < 0.01.
