Table 3.

Characteristics of the four classes of ex-siRNA

sRNA class	Strand bias	Average log2 fold change from WT					No. of exons	ex-siRNA (%)	5′ Ua (%)	3′ penult. Ub (%)
		dcl1−	dcl2−	Dcl1−/2−	rdrp1−	rdrp2−
Class 1	−0.78	0.34	−12.84	−8.86	3.74	−1.33	9	13.42	92.18	6.11
Class 2	−0.34	0.55	−3.79	−8.72	−5.02	1.36	222	58.74	92.12	16.63
Class 3	0.90	−0.47	0.12	−3.21	−4.52	−3.50	88	27.36	8.39	49.57
Class 4	0.83	−2.45	−0.26	−1.02	−2.61	−2.42	5	0.48	28.28	66.61

Different characteristics of ex-siRNAs from each classes are shown in the table. Strand bias indicates orientation to mRNAs, where 1 corresponds to all sRNAs in the same orientation as the mRNA, 0 to equal mixture of sRNAs on both strands and −1 to all sRNAs antisense to mRNAs. Numbers in bold indicate a higher than 4-fold down-regulation in the corresponding mutants relative to wild type.

^aThe percentage of redundant reads that contain a uracil in the 5′ most position.

^bThe last column shows the percentage of redundant reads that contain a uracil in the 3′ penultimate position.