IFIH1 and type 1 diabetes mellitus: The purpose of this study was to investigate the effect of the T1D-associated variation on mRNA expression of IFIH1 and all other genes in the LD block by allelic expression imbalance, using single-nucleotide primer extension (SNuPE) on RT-PCR products of heterozygous lymphocyte, thymic and pancreatic RNA samples, to cover tissues most important in T1D.