T/B collaboration in vivo vs. in vitro.
D000818:Animals; D000938:Antigen-Presenting Cells / Q000276:immunology; D001402:B-Lymphocytes / Q000276:immunology*; D002450:Cell Communication; D000949:Histocompatibility Antigens Class II / Q000276:immunology; D007111:Immunity, Cellular; D066298:In Vitro Techniques; D008213:Lymphocyte Activation; D008954:Models, Biological; D013601:T-Lymphocytes / Q000276:immunology*
D000949:Histocompatibility Antigens Class II