1. Department of Biology, California State University, Northridge, Northridge, California, USA
2. GlycoAnalytics Core, UC San Diego, Health Sciences, La Jolla, California, USA
3. Produce Safety and Microbiology Research Unit, Western Regional Research Center, Agricultural Research Service, U.S. Department of Agriculture, Albany, California, USA
4. School of Animal and Comparative Biomedical Sciences, University of Arizona, Tucson, Arizona, USA