- Stereospecificity and PAX6 function direct Hoxd4 neural enhancer activity along the antero-posterior axis. Nolte, C., Rastegar, M., Amores, A., Bouchard, M., Grote, D., Maas, R., Kovacs, E.N., Postlethwait, J., Rambaldi, I., Rowan, S., Yan, Y.L., Zhang, F., Featherstone, M. Dev. Biol. (2006)