1. Department of Radiology and Biomedical Imaging, University of California, San Francisco, California 94143, United States
2. ProLynx Inc., San Francisco, California 94158, United States
3. Helen Diller Family Comprehensive Cancer Center, University of California San Francisco, San Francisco, California 94143-0981, United States
4. Department of Pharmaceutical Chemistry, University of California, San Francisco, California 94158-2517, United States