B cells from MD4 or MD4/ML5 mice treated with anti-CD79b mAb or control IgG were enriched by depletion of CD43+ cells with magnetic beads (MACS anti-mouse CD43; Miltenyi Biotec). A total of 106 B cells in 200 ml PBS was adoptively transferred by i.v. injection. One hour later the recipient mice were immunized i.p. with HEL-conjugated SRBCs as described previously (29 (link)).