Elsevier Policy on Article Withdrawal (http://www.elsevier.com/locate/withdrawalpolicy).This article has been retracted at the request of Edward Egelman, Editor-in-Chief.The editors have noted that there is a substantial overlap of figures and text between this Biophysical Journal article and D. Rutkauskas, V. Novoderezkhin, R.J. Cogdell and R. van Grondelle.