1. Laboratory of Receptor Biology and Gene Expression, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA.
2. Department of Physics, University of Maryland, College Park, MD 20742, USA.
3. Department of Biochemistry and Molecular Biology, University of Southern Denmark, Odense, Denmark.
4. Institute of Biomedicine, University of Eastern Finland, Kuopio, P.O. Box 1627, 70211 Kuopio, Finland.
5. Instituto de Fisiología, Biología Molecular y Neurociencias (IFIBYNE), CONICET-Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Buenos Aires C1428EGA, Argentina.
6. Institute for Physical Science and Technology, University of Maryland, College Park, MD 20742, USA.