- Six3 repression of Wnt signaling in the anterior neuroectoderm is essential for vertebrate forebrain development. Lagutin, O.V., Zhu, C.C., Kobayashi, D., Topczewski, J., Shimamura, K., Puelles, L., Russell, H.R., McKinnon, P.J., Solnica-Krezel, L., Oliver, G. Genes Dev. (2003)