- The crystal structure of the PX domain from p40(phox) bound to phosphatidylinositol 3-phosphate. Bravo, J., Karathanassis, D., Pacold, C.M., Pacold, M.E., Ellson, C.D., Anderson, K.E., Butler, P.J., Lavenir, I., Perisic, O., Hawkins, P.T., Stephens, L., Williams, R.L. Mol. Cell (2001)