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Abstract
Transgenic NOD backcross mice expressing pancreatic interleukin 10 (IL-10) were crossed and backcrossed to NOD.B6 Idd3 Idd10 mice, which have diabetes-resistance alleles at Idd3 and Idd10 on chromosome 3 and have a very low frequency diabetes and insulitis. Insulitis and diabetes developed in almost all IL-10 transgenic backcross 1 (BC1) mice of the H2g1/gl haplotype regardless of the allelic status at Idd3 and Idd10. Furthermore, diabetes occurred in 23% of IL-10 transgenic H2g7/,d BC1 mice. These results indicate that pancreatic IL-10 is able to overcome the diabetes protection afforded by C57BL/6 (B6)-derived alleles at Idd3 and Idd10 as well as the absence of NOD MHC homozygosity, if other non-MHC NOD-derived Idd alleles are provided.