1. Laboratoire de Biologie Moléculaire Eucaryote (LBME), Centre de Biologie Intégrative (CBI), CNRS, University of Toulouse, UPS, 31062 Toulouse, France.
2. Department of Bionanoscience, Delft University of Technology, 2628 CJ, Delft, Netherlands.
3. Institut Universitaire de France (IUF), Paris, France.
4. Spectroscopy Department, Physics Division, National Research Centre, Dokki, 12622 Cairo, Egypt.