The current model of short interspersed nuclear element (SINE) mobility suggests that these non-coding retroposons are able to recruit for their own benefits the enzymatic machinery encoded by autonomous long interspersed nuclear elements (LINEs). The recent characterization of potential SINE-LINE partner pairs that share common 3' end sequences concurs with this model and has led to a potent picture of tRNA-derived SINEs consisting of a tripartite functional structure (Mol. Cell.
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