Affiliation: | 1. Biosystems and Biomaterials Division, National Institute of Standards and Technology, Gaithersburg, MD 20899 (USA);2. Hollings Marine Laboratory, Chemical Sciences Division, National Institute of Standards and Technology, Charleston, SC 29412 (USA);3. Institute for Bioscience and Biotechnology Research, Biomolecular Measurement Division, National Institute of Standards and Technology, Rockville, MD 20850 (USA);4. Chemical Sciences Division, National Institute of Standards and Technology, Gaithersburg, MD 20899 (USA) |