1. Department of Early Discovery Biochemistry, Genentech, 1 DNA Way, South San Francisco, CA 94080, USA.
2. Department of Protein Chemistry, Genentech, 1 DNA Way, South San Francisco, CA 94080, USA.
3. Department of Biochemical Pharmacology, Genentech, 1 DNA Way, South San Francisco, CA 94080, USA.
4. Department of Structural Biology, Genentech, 1 DNA Way, South San Francisco, CA 94080, USA.