1. Department
of Chemical and Biomolecular Engineering, Tulane University, New Orleans, Louisiana 70118, United States
2. Department of
Biochemistry and Cancer Institute of University of Mississippi Medical
Center, Jackson, Mississippi 39216, United States
3. Coordinated
Instrumentation Facility, Tulane University, New Orleans, Louisiana 70118, United States
4. MRC
Laboratory for Molecular Cell Biology, University College of London, London, U.K.