Immune response to the pre-S(1) region of the hepatitis B surface antigen (HBsAg): a pre-S(1)-specific T cell response can bypass nonresponsiveness to the pre-S(2) and S regions of HBsAg - Milich,D.R.; McLachlan,A.; Chisari,F.V.; Kent,S.B.; Thorton,G.B. (J Immunol, 1986)