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Expression levels of E. coli 83972 in minimal medium (MOPS) and human urine (in vitro and in vivo) of all genes involved in the biosynthesis of amino acids, as determined by microarray analysis. Genes that were mutated in E. coli 83972 are indicated in boldface. Asterisks indicate expression levels in human urine that were significantly higher than those in MOPS (P < 0.05).
