- The Human Cytochrome c Oxidase Assembly Factors SCO1 and SCO2 Have Regulatory Roles in the Maintenance of Cellular Copper Homeostasis. Leary, S.C., Cobine, P.A., Kaufman, B.A., Guercin, G.H., Mattman, A., Palaty, J., Lockitch, G., Winge, D.R., Rustin, P., Horvath, R., Shoubridge, E.A. Cell metabolism (2007)