- The role of cathepsin C in Papillon-Lefèvre syndrome, prepubertal periodontitis, and aggressive periodontitis. Hewitt, C., McCormick, D., Linden, G., Turk, D., Stern, I., Wallace, I., Southern, L., Zhang, L., Howard, R., Bullon, P., Wong, M., Widmer, R., Gaffar, K.A., Awawdeh, L., Briggs, J., Yaghmai, R., Jabs, E.W., Hoeger, P., Bleck, O., Rüdiger, S.G., Petersilka, G., Battino, M., Brett, P., Hattab, F., Al-Hamed, M., Sloan, P., Toomes, C., Dixon, M., James, J., Read, A.P., Thakker, N. Hum. Mutat. (2004)