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Effect of NaCl concentration on the uptake of radiolabeled glycine betaine (A), choline (B), or proline (C) by P. syringae pv. tomato DC3000 and the ΔopuCA mutant. Uptake was examined in 1/2-21C medium in the presence of 0, 0.2, 0.4, and 0.6 M of NaCl. Radiolabeled substrates were provided at a concentration of 5 μM. Values are the means ± SEM (n = 3).
