The expression of iron transport genes in the duodenum of hbd and wild-type mice. Duodenal expression of Dmt1 (both the IRE and non-IRE splice variants), Dcytb, and ferroportin 1 mRNA in wild-type () and hbd (▪) mice on either a control or iron-deficient diet was determined by ribonuclease protection assay. The mRNA encoding ribosomal protein Arbp was used as a normalization control. (A) Representative assays for each gene. (B) Band intensities for each gene were measured by densitometry and graphed as a proportion of 36B4 expression. The data represent the mean ± SEM (n = 5-11; ^*P < .05).