5ZUX:
reference: How bacterial xenogeneic silencer rok distinguishes foreign from self DNA in its resident genome., Duan B, Ding P, Hughes TR, Navarre WW, Liu J, Xia B, Nucleic Acids Res. 2018 Sep 25. pii: 5106470. doi: 10.1093/nar/gky836. PMID: 30252102

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