Tuukkanen, A., Kaila, V. R. I., Laakkonen, L., Hummer, G., & Wikström, M. (2007). Dynamics of the glutamic acid 242 side chain in cytochrome c oxidase. Biochimica et Biophysica Acta: BBA, 1767(9), 1102-1106. doi:10.1016/j.bbabio.2007.06.010.