- The granzyme B inhibitor SERPINB9 (protease inhibitor 9) circulates in blood and increases on primary cytomegalovirus infection after renal transplantation. Rowshani, A.T., Strik, M.C., Molenaar, R., Yong, S.L., Wolbink, A.M., Bemelman, F.J., Hack, C.E., Ten Berge, I.J. J. Infect. Dis. (2005)