1. Institute of Molecular Biology, University of Oregon, 297A Klamath Hall, 1370 Franklin Blvd, Eugene, OR 97403, USA
2. Department of Chemistry and Biochemistry, University of Oregon, 297A Klamath Hall, 1370 Franklin Blvd, Eugene, OR 97403, USA
3. Department of Biology, University of Oregon, 297A Klamath Hall, 1370 Franklin Blvd, Eugene, OR 97403, USA