1. Department of Dermatology, University of California, San Diego, La Jolla, CA 92092, USA.
2. Collaborative Mass Spectrometry Innovation Center, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California, San Diego, La Jolla, CA 92092, USA.
3. Department of Bioengineering, University of California, San Diego, La Jolla, CA 92092, USA.
4. Rho Federal Systems Division Inc., Chapel Hill, NC 27517, USA.
5. Division of Allergy and Immunology, Department of Pediatrics, National Jewish Health, Denver, CO 80206, USA.
6. Departments of Chemistry, Biochemistry and Pharmacology, University of California, San Diego, La Jolla, CA 92092, USA.
7. Department of Microbiology and Immunology, University of Rochester, Rochester, NY 14611, USA.