1. Department of Hematology and Oncology, School of Medicine, The University of Tennessee Health Science Center, 920 Madison Ave, P.O.Box-38103, Memphis, Tennessee, United States
2. Department of Neurology, Duke University Medical Center, Durham, North Carolina, United States
3. Department of Molecular Biology and Biochemistry, Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo namesti 542/2, P.O. Box:16000, Prague, Czech Republic