1. Laboratory of Bacterial Polysaccharides, Division of Bacterial, Parasitic and Allergenic Products, Office of Vaccines Research and Review, FDA, Silver Spring, MD 20901, USA
2. Department of Biological Engineering, University of Maryland, Baltimore County, MD 21236, USA
3. Division of Food Ingredients, Office of Food Additive Safety, Center for Food Safety and Applied Nutrition, FDA, College Park, MD 20074, USA