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We have previously shown that rat liver epithelial cells were more sensitive to TGF-β 1 when they were transfected with c-fos cDNA. We analyzed the production of TGF-β and TGF-β 1 binding proteins in transfected and parental cells. TGF-β-like activity released in the medium was reduced in c-fos expressing cells. TGF-β 1 binding sites were more numerous in transfected cells...