- Brown adipocytes differentiated in vitro can express the gene for the uncoupling protein thermogenin: effects of hypothyroidism and norepinephrine. Rehnmark, S., Kopecký, J., Jacobsson, A., Néchad, M., Herron, D., Nelson, B.D., Obregon, M.J., Nedergaard, J., Cannon, B. Exp. Cell Res. (1989)