1. Department of Chemistry, Stanford University, Stanford, California 94305, United States
2. Biological Toxins, Centre for Biological Threats and Special Pathogens, Robert Koch Institute, Berlin 13353, Germany
3. Department of Biology, Stanford University, Stanford, California 94305, United States
4. Department of Genetics, Stanford University, Stanford, California 94305, United States
5. Chan Zuckerberg Biohub − San Francisco, San Francisco, California 94158, United States