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Effects of an hha mutation on Salmonella SL1344 invasion after growth under repressing conditions. Cultures of SL1344 or TF80 were grown under activating low-oxygen, high-osmolarity growth conditions as the positive control or high-oxygen and high-osmolarity, low-oxygen and low-osmolarity, or high-oxygen and low-osmolarity repressing growth conditions before assaying for invasion of the bacteria into HEp-2 cells.
