TGFB2 and occult macular dystrophy: Interestingly, the effects of OMD on the SCE cell barrier and permeability were observed even without TGF-β2 stimulation, as shown in Fig. 7A. OMD significantly decreased TEER compared with the vehicle-treated control, whereas OMD did not exert significant effects without TGF-β2 stimulation in HTM cells.