- Basic transcription element-binding protein (BTEB) is a thyroid hormone-regulated gene in the developing central nervous system. Evidence for a role in neurite outgrowth. Denver, R.J., Ouellet, L., Furling, D., Kobayashi, A., Fujii-Kuriyama, Y., Puymirat, J. J. Biol. Chem. (1999)