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Expression of the pstS-cat and ugpA-cat transcriptional fusions in C. glutamicum ATCC 13032(pET2-pst) and ATCC 13032(pET2-ugp) during the response to Pi starvation. The activities obtained from two or more independent cultivations varied less than 20% and were normalized to the activity before the shift to Pi starvation conditions. Symbols: •, pstS-cat fusion; ○, ugpA-cat fusion.
