- Monocytic differentiation modulates apoptotic response to cytotoxic anti-Fas antibody and tumor necrosis factor alpha in human monoblast U937 cells. Kikuchi, H., Iizuka, R., Sugiyama, S., Gon, G., Mori, H., Arai, M., Mizumoto, K., Imajoh-Ohmi, S. J. Leukoc. Biol. (1996)