Fig. 7From: Full-length autonomous transposable elements are preferentially targeted by expression-dependent forms of RNA-directed DNA methylation Model of full-length TE specificity for RDR6-RdDM. Full-length TE mRNAs are specifically cleaved and degraded into secondary 21–22 nt siRNAs, driving the specificity of RDR6-RdDM. An unknown filter blocks the mRNA cleavage, RNAi, and secondary siRNA production of mRNAs from fragmented TEsBack to article page