CRISPR/Cas9 genome editing uses guide RNAs, targeting DNA sequence 5'-aagctaggactttaatactc-3';, are used to insert a loxP flanked STOP cassette into intron 4 followed by a kinase-dead point mutation (D154A) into exon 5. Plk4-201 was used as reference for the exon number and the guide sequences. (J:329155)