Similar title to Galis, F., Van Dooren, T.J.M., Feuth, J.D., Metz, J.A.J., Witkam, A., Ruinard, S., Steigenga, M.J., & Wijnaendts, L.C.D. (2006). Extreme selection in humans against homeotic transformations of cervical vertebrae. Evolution 60 (12) 2643-2654. 10.1111/j.0014-3820.2006.tb01896.x.