Genomic DNA was extracted from ear clip biopsies using the DNA Extract All Reagents Kit (Applied Biosystems) according to the manufacturer's instructions. Genotyping primers for SR-PCR assays were chosen to be at least 200 bp away from the sequences targeted by sgRNA, depending on available sequences for design. PCR assays were optimised and performed as previously described (27 (link)). The PCR products were purified employing a QIAquick Gel Extraction Kit (Qiagen) and sent for Sanger sequencing.
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