2Franco A, Guidotti LG, Hobbs MV, et al. Pathogepic effect of CD4 positive helper 1 cell in hepatitis B virus transgenic mice. J Immunol, 1997, 159:2001-2008.
3Kohayashi K, Ishii M, Igarashi T, et al. Profiles of cytokines produced by CD4- positive T lymphocytes stimulated by anti - CD3 antibody in patients with chronic hepatitis. J Gastroenterol, 1998 ,33:500- 507.
4Lamont AG, Adorini L. IL- 12 : a key cytokine in immune regulation. Immunol Today, 1996,17:214- 217.
