Clara L Kielkopf -
Laboratories of Molecular Biophysics and Howard Hughes Medical Institute, The Rockefeller University,1230 York Avenue, New York, New York 10021
Stephen K Burley -
Laboratories of Molecular Biophysics and Howard Hughes Medical Institute, The Rockefeller University,1230 York Avenue, New York, New York 10021
Brookhaven National Laboratory, National Synchrotron Light Source (US)