Enables copper ion binding activity. Involved in several processes, including female pregnancy; gland development; and response to copper ion. Located in extracellular space. Is anchored component of plasma membrane. Used to study brain edema and iron metabolism disease. Biomarker of Wilson disease; brain ischemia; heart disease; and hyperthyroidism. Human ortholog(s) of this gene implicated in aceruloplasminemia; epilepsy; and hemosiderosis. Orthologous to human CP (ceruloplasmin). [provided by Alliance of Genome Resources, Apr 2022]