Nuclear BAFF-R is a high-molecular-weight multimer. (A) Whole-cell lysates (100 μg) from NHL-B cells (MS) transfected with a BAFF-R expression plasmid were treated with (D, denatured) or without (N, nondenatured) β-ME and then probed with anti–BAFF-R antibody by Western blot analysis. (B) Nuclear lysates (50 μg) from NHL-B cells were treated with or without β-ME and then probed with anti–BAFF-R antibody.