- A Leu7Pro mutation in the signal peptide of platelet glycoprotein (GP)IX in a case of Bernard-Soulier syndrome abolishes surface expression of the GPIb-V-IX complex. Lanza, F., De La Salle, C., Baas, M.J., Schwartz, A., Boval, B., Cazenave, J.P., Caen, J.P. Br. J. Haematol. (2002)