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B lymphocytes partially contribute to autoimmune type 1 diabetes (T1D) as a subset of APC with a preferential ability to trigger pathogenic CD4 T cells. We hypothesized that this resulted fromthe unique ability of B lymphocytes to take up pancreatic β cell proteins through Ig mediated capture. T1D was significantly delayed, but not prevented, in a NOD stock in which the B lymphocyteIg repertoire was strongly restricted because of the allelic exclusion induced by transgenic Ig molecules specific for the disease irrelevant hen egg lysozyme (HEL) protein (NOD.IgHEL mice). However, introducing the Igμ^null mutation to eliminate the small residual numbers of non‐transgenic B lymphocytes in the NOD.IgHEL stock strongly suppressed T1D to the same low levels that characterize B lymphocyte deficient NOD.Igμ^null mice. In contrast to standard NOD mice, both the NOD.IgHEL.Igμ^null and NOD.Igμ^null stocks were unable …