Despite the presence of polycythemia in Slc30a10–/– Hif1afl/fl and Slc30a10–/– Hif1afl/fl Alb mice, neither total nor nonheme iron levels were increased in livers from these mice relative to their Slc30a10+/+ counterparts (Supplemental Figure 7, C and D). Here, SLC30A10 is linked to polycythemia.