passages.id: split_6_test_1490_passage
passages.type: progene_text
passages.text: A yeiL - lacZ transcriptional fusion showed that aerobic yeiL expression increases at least sixfold during stationary phase , requires RpoS , and is positively autoregulated by YeiL , positively activated by Lrp ( and IHF in the absence of FNR ) and negatively regulated by FNR .