Guide RNA for each target genes was designed with CRISPRdirect (47) ( Target specific CRISPR RNA (crRNA), ATTO550-conjugated trans-activating crRNA (tracrRNA), Cas9 protein were purchased from Integrated DNA Technologies Inc. (IL, USA). Target-specific sequence of crRNA for Alpl (NM_007431) without proto-spacer adjacent motif sequence is CTTGCTGTCGCCAGTAACTG (318-340). Ribonucleoprotein (RNP) complex was formed according to the manufacturer’s protocol, and RNPs were transfected to 1 × 105 KUSA-A1 cells using the Neon electroporation system (Thermo Fisher Scientific, MA, USA) with 10-μl tips. Nuclear localization of ATTO550 particles were confirmed on the next day of transfection under a fluorescent microscope (Nikon, Japan).

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