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Effect of various concentrations of Achillea on the expression of TGFβ1 protein in mouse fibroblast cell culture supernatants. Cells were treated with different concentration of Achillea (5 and 10 µg/ml) at different time intervals treatment (12 and hours) and the expression of TGFβ1 protein was assessed by ELISA (*p < 0.05, **p < 0.01)
