- Targeted deletion of a cis-regulatory region reveals differential gene dosage requirements for Pdx1 in foregut organ differentiation and pancreas formation. Fujitani, Y., Fujitani, S., Boyer, D.F., Gannon, M., Kawaguchi, Y., Ray, M., Shiota, M., Stein, R.W., Magnuson, M.A., Wright, C.V. Genes Dev. (2006)