- Disruption of the protein C inhibitor gene results in impaired spermatogenesis and male infertility. Uhrin, P., Dewerchin, M., Hilpert, M., Chrenek, P., Schöfer, C., Zechmeister-Machhart, M., Krönke, G., Vales, A., Carmeliet, P., Binder, B.R., Geiger, M. J. Clin. Invest. (2000)