Iron (⁵⁹Fe) delivery to developing fetuses in Th3/+ dams during late-stage pregnancy. Radiotracer iron was provided to mice after oral intragastric gavage; 24 hours later, ⁵⁹Fe accumulation in the uteruses, placentas, and fetuses was measured. ⁵⁹Fe amounts are presented as a percentage of total iron absorbed in the uteruses (A) and all the fetuses (C), or as radioactive counts (CPM per mg tissue) in the placentas (B), and in individual fetuses (D) and fetal livers (E). Data represent mean ± SD for n = 5 mice per group for panels A,C,E or n = 10 to 20 mice per group for panels B,D, and were analyzed by one-way ANOVA followed by Tukey multiple comparisons test. Groups labeled with different letters are significantly different from one another (P < .05). Significant main effects: panels A,C-E, P < .0001; panel B, P < .01.