[1
]Chemical Biology Laboratory, Center for Cancer Research, National Cancer Institute,
Frederick, Maryland 21702, United States
[2
]Laboratory for in Vivo Cellular and Molecular Imaging, ICMI-BEFY/MIMA, Vrije Universiteit
Brussel, Laarbeeklaan 103, 1090 Brussels, Belgium
[3
]Small Animal Imaging Program, Frederick National Laboratory for Cancer Research, Leidos
Biomedical Research Inc., Frederick, Maryland 21702, United States
[4
]Janelia Research Campus, Howard Hughes Medical Institute, Ashburn, Virginia 20147,
United States