Genotyping PCR was performed using genomic DNA extracted from the toe clipping with the primers listed in Supplemental Materials. For Sanger sequencing, PCR products were first gel-purified and cloned into the pCRII Topo vector (Thermo Fisher Scientific K460001) and sequenced with T7 or SP6 primers. Long-range PCR was performed using LongAmp Hot Start Taq 2X Master Mix (NEB M0533S) to examine genomic DNA that was purified by a Monarch Genomic DNA Purification kit (NEB T3010). The large amplicons were gel-purified and cloned into the pCR-XL-2-TOPO vector (Thermo Fisher Scientific K8050-10). The top off-targeting sites were predicted by Cas-OFFinder (Bae et al. 2014 (link)).