3D1D:
reference: An alpha motif at Tas3 C terminus mediates RITS cis spreading and promotes heterochromatic gene silencing., Li H, Motamedi MR, Yip CK, Wang Z, Walz T, Patel DJ, Moazed D, Mol Cell. 2009 Apr 24;34(2):155-67. PMID: 19394293

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