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1H NMR spectra of the K antigens from S. meliloti NRG247 (A), S. meliloti NRG185 (B), S. fredii USDA208 (C), S. fredii USDA201 (D), Sinorhizobium sp. strain NGR234 (E), and S. fredii HH303 (F). The chemical shift of the 2HOH resonance (4.55 or 4.75 ppm) is temperature dependent. See the text for detailed descriptions.
