- Attenuation of Th1 effector cell responses and susceptibility to experimental allergic encephalomyelitis in histamine H2 receptor knockout mice is due to dysregulation of cytokine production by antigen-presenting cells. Teuscher, C., Poynter, M.E., Offner, H., Zamora, A., Watanabe, T., Fillmore, P.D., Zachary, J.F., Blankenhorn, E.P. Am. J. Pathol. (2004)