PCR mixtures containing amplicons spanning RGN target sequences were purified using SureClean Plus (Bioline) according to the manufacturer's recommendations. Next, the purified PCR amplicons were subjected to Sanger sequencing (BaseClear, Leiden, the Netherlands). The indel spectra were obtained through the online TIDE tool (http://tide.nki.nl) (40 (link)) by using as input the PCR product chromatograms derived from edited and unedited DNA as indicated. The indel size ranges were set to 20 nucleotides upstream and downstream of the RGN target sequences.