- Flavins inhibit human cytomegalovirus UL80 protease via disulfide bond formation. Baum, E.Z., Ding, W.D., Siegel, M.M., Hulmes, J., Bebernitz, G.A., Sridharan, L., Tabei, K., Krishnamurthy, G., Carofiglio, T., Groves, J.T., Bloom, J.D., DiGrandi, M., Bradley, M., Ellestad, G., Seddon, A.P., Gluzman, Y. Biochemistry (1996)