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  1. 6 A 4 L-methionine uptake (nmol/mg dry weight) 2 0 2 B 1.5 D-methionine uptake (nmol/mg dry weight) 1 0.5 0 0 2 10 4 6 8 Time (min) Figure S3. Inhibition of the uptake of 1-[14C]L-methionine (A) and 1-[14C] D-methionine (B) by the energy poisoning compounds carbonyl cyanide 4- trifluoromethoxyphenylhydrazone (FCCP) and sodium arsenate. The wild type cells, prepared as described in Figure 2, were incubated with 2 M FCCP or 5 mM sodium arsenate at 37 oC for 10 min prior to addition of [14C]methionine. Transport assays were conducted as described in Figure 2. , cells with no energy poisoning compound; , cells plus FCCP; , cells plus sodium arsenate.