Fig. 3. Effects of TGF-ß1 and EGF on epithelial barrier function in filter-cultured thyrocytes. (A) Transepithelial resistance (TER) measured consecutively in the same cultures at the indicated times. Mean±s.d. (n=3). (B) Apical-to-basal transepithelial flux of [3H]inulin (0.1 µCi/ml) recorded after growth factor stimulation for 24 hours. Mean±s.d. (n=3). E, EGF (10 ng/ml); T, TGF-ß1 (10 ng/ml).