- A microdeletion in cytochrome c oxidase (COX) subunit III associated with COX deficiency and recurrent myoglobinuria. Keightley, J.A., Hoffbuhr, K.C., Burton, M.D., Salas, V.M., Johnston, W.S., Penn, A.M., Buist, N.R., Kennaway, N.G. Nat. Genet. (1996)