1. Department
of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, 240 Longwood Avenue, Boston, Massachusetts 02115, United States
2. Howard Hughes Medical Institute and Department
of Molecular and Cell Biology, University of California, Berkeley, California 94720, United States
3. Leibniz Institute for Natural Product Research
and Infection Biology e.V., Hans-Knöll Institute (HKI), Beutenbergstrasse
11a, 07745 Jena, Germany