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Time courses of growth (OD562) (open symbols) and l-cysteine plus l-cystine production (filled symbols) by cells of strain JM39ΔtnaA with pACYC-M256I carrying the altered cysE gene and pUC118 (circles) or pUCbcr carrying bcr (squares). Detailed procedures for culture are described in the text. Values indicate means and standard deviations of results from three independent experiments.
