1. Chemical
Biology Laboratory, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Frederick, Maryland 21702, United States
2. Laboratory
of Receptor Biology and Gene Expression, Center for Cancer Research,
National Cancer Institute, National Institutes of Health, Bethesda, Maryland 20817, United States
3. Protein
Characterization Laboratory, Cancer Research Technology Program, Frederick
National Laboratory for Cancer Research, Leidos Biomedical Research, Inc., Frederick, Maryland 21702, United States