Iron levels in CP KO mice tissue. WT and CP KO mice were aged to 5 and 14 months. Iron was measured in homogenized (a) substantia ngira (b) cerebellum (c) liver (d) spleen and (e) heart by ICP-MS and corrected for tissue weight. (f) Plasma extract from blood was measured for iron by ICP-MS. Data are mean ± std error. ‘n’ is represented in graph columns. *p < 0.05, **p < 0.01, ***p < 0.001 as indicated. ^p < 0.05, ^^^p < 0.001 relative to 5-month-old of the same genotype.