Diversification of complex butterfly wing patterns by repeated regulatory evolution of a Wnt ligand

Martin A., R. Papa, N. J. Nadeau, R. I. Hill, B. A. Counterman, G. Halder, C. D. Jiggins, M. R. Kronforst, A. D. Long, W. O. McMillan and R. D. Reed. 2012. Diversification of complex butterfly wing patterns by repeated regulatory evolution of a Wnt ligand.  Proc. Natl. Acad. Sci. USA 109: 12632-12637.