| Caeruloplasmin | | Iron and copper transport | | Decreased circulating copper levels, iron deficiency |
| Cytochrome C oxidase | | Mitochondrial respiration | | Hypothermia, muscle weakness |
| Dopamine β-hydroxylase | | Catecholamine production | | Hypothermia, neurological defects |
| Lysyl oxidase | | Connective tissue formation | | Laxity of skin and joints |
| Peptidylglycine α-amidating mono-oxygenase | | Peptide amidation | | Neuroendocrine defects |
| Superoxide dismutase | | Antioxidant defence | | Diminished protection against oxidative stress |
| Tyrosinase | | Pigment formation | | Hypopigmentation of hair and skin |