1. Research Institute of Physics, Saint Petersburg University, 199034 Saint Petersburg, Russian Republic
2. Department of Physical and Macromolecular Chemistry, Faculty of Science, Charles University in Prague, Albertov 2030, 128 40 Prague 2, Czech Republic
3. Cell Research Institute, The University of Texas at Austin, Austin, Texas 78712
4. Department of Chemistry and Biochemistry and Center for Polymer Research, The University of Texas at Austin, Austin, Texas 78712