(A) Change in serum iron concentration after the i.v. infusion of damaged red blood cells in 10-wk-old Cp+/+ and Cp−/− mice. Results are expressed as means ± standard deviations, n = 8 per time point (∗, P < 0.001). (B) Change in serum iron concentration after i.v. infusion of damaged red blood cells. Arrow indicates time of infusion of ceruloplasmin (Cp) or apoceruloplasmin (apoCp) as 6 μg/100 μl of circulating blood volume. Results expressed as means ± standard deviations, n = 8 per time point (∗, P < 0.001). (C) Change in serum iron concentration after serial phlebotomy in 10-wk-old Cp+/+ and Cp−/− mice. Results are expressed as means ± standard deviations, n = 6 per time point (∗, P < 0.001). Arrow indicates timing of infusion of ceruloplasmin (Cp) or apoceruloplasmin (apoCp) as 6 μg/100 μl of circulating blood volume.