B cells expressing Ig transgenes respond to a T-dependent antigen only in the presence of Ia-compatible T cells.
O'Brien RL, Marrack P, Storb U, Kappler JW. B cells expressing Ig transgenes respond to a T-dependent antigen only in the presence of Ia-compatible T cells. J Immunol. 1988 Nov 15; 141(10):3335-41.