Enables peroxidase activity. Involved in several processes, including response to food; response to gold nanoparticle; and response to lipopolysaccharide. Located in extracellular space. Used to study acute kidney failure. Biomarker of chronic obstructive pulmonary disease; cystitis; and renovascular hypertension. Human ortholog(s) of this gene implicated in several diseases, including Alzheimer's disease 1; cystic fibrosis; kidney failure (multiple); liver disease (multiple); and lung disease (multiple). Orthologous to human MPO (myeloperoxidase). [provided by Alliance of Genome Resources, Apr 2022]