- The LIM-homeobox gene Lhx8 is required for the development of many cholinergic neurons in the mouse forebrain. Zhao, Y., Marín, O., Hermesz, E., Powell, A., Flames, N., Palkovits, M., Rubenstein, J.L., Westphal, H. Proc. Natl. Acad. Sci. U.S.A. (2003)