A Novel Small RNA Promotes Motility and Virulence of Enterohemorrhagic Escherichia coli O157:H7 in Response to Ammonium   Tianyuan Jia, Bin Liu, Huiqian Mu, Chengqian Qian, Lu Wang, Linxing Li, Gege Lu, Wenxuan Zhu, Xi Guo, Bin Yang, Di Huang, Lu Feng*, Bin Liu*    mBio. 2021 Mar 9;12(2):e03605-20