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Effect of betaine on the intracellular oxidation of choline. H. elongata was grown in M63 containing 0.5 (circles) or 2.0 (squares) M NaCl and [methyl-14C]choline (closed symbols) and betaine (open symbols). Oxidation of choline was determined as described in the legend to Fig. 2. Experiments (at both salt concentrations) were repeated twice, and the data correspond to means which on no occasion varied by more than 5%.
