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Table 1.

Roles of DCL, RDR and AGO proteins in Arabidopsis

Target RNA Small RNA accumulation RdDM establishment RdDM maintenance
DCL1   miRNA precursors   yes   ND   ND  
DCL2   turnip crinkle virus   yes   ND   ND  
DCL3   endogenous templates   yes   yes   partial  
RDR2   endogenous templates   yes   yes   yes  
RDR6   non-IR transgenes   yes   ND   yes  
AGO1   miRNA precursors   yes   ND   ND  
  non-IR transgenes   yes   ND   yes  
AGO4   endogenous templates   yes   yes   yes  
  IR transgenes   no   no   yes  
Target RNA Small RNA accumulation RdDM establishment RdDM maintenance
DCL1   miRNA precursors   yes   ND   ND  
DCL2   turnip crinkle virus   yes   ND   ND  
DCL3   endogenous templates   yes   yes   partial  
RDR2   endogenous templates   yes   yes   yes  
RDR6   non-IR transgenes   yes   ND   yes  
AGO1   miRNA precursors   yes   ND   ND  
  non-IR transgenes   yes   ND   yes  
AGO4   endogenous templates   yes   yes   yes  
  IR transgenes   no   no   yes  

ND, not determined.

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