1. Department of Biological Sciences; Purdue University; 915 West State Street; West Lafayette; IN; 47907; USA
2. METACyt Biochemical Analysis Center; Department of Chemistry; Indiana University; Bloomington; IN; 47405; USA
3. Weill Institute for Cell and Molecular Biology and Department of Molecular Biology and Genetics; Cornell University; Ithaca; NY; 14853; USA