UCLA-DOE Institute for Genomics & Proteomics, Department of Chemistry, Howard Hughes Medical Institute, Box 951570, UCLA, Los Angeles, CA 90095, USA. lukasz@mbi.ucla.edu|UCLA-DOE Institute for Genomics & Proteomics, Department of Chemistry, Howard Hughes Medical Institute, Box 951570, UCLA, Los Angeles, CA 90095, USA. lukasz@mbi.ucla.edu