A&B HEK293 cells integrated with HR or NHEJ reporter were transfected with the indicated siRNAs and subjected to the HR (A) or NHEJ assay (B) as described in Methods. Data presented as mean ±SD of four biological replicates, and positive cell percentages as compared with control group. Two-tailed Student's t test, **P < 0.01. NS: no significant difference. 