1 McKetta Department of Chemical Engineering, The University of Texas at Austin, 200 E Dean Keeton St. Stop C0400, Austin, TX, USA.
2 Mass Spectrometry Facility, Department of Chemistry, The University of Texas at Austin, 105 E 24th Street, Austin, TX, USA.
3 Institute for Cellular and Molecular Biology, The University of Texas at Austin, 2500 Speedway Avenue, Austin, TX, USA.
4 McKetta Department of Chemical Engineering, The University of Texas at Austin, 200 E Dean Keeton St. Stop C0400, Austin, TX, USA. halper@che.utexas.edu.
5 Institute for Cellular and Molecular Biology, The University of Texas at Austin, 2500 Speedway Avenue, Austin, TX, USA. halper@che.utexas.edu.