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. 1998 Apr 6;187(7):1081–1091. doi: 10.1084/jem.187.7.1081

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Defective anti-IgM–triggered proliferation in xid B cells. B cells from xid (black bar) and CBA/Ca (gray bar) were stimulated with mAbs against CD40 (A) or F(ab′)₂ anti-IgM (B) and pulsed with [³H]thymidine for 1 h at the time indicated. Standard errors are shown and results are representative of three independent experiments.