Superficially wild-type. CRISPR/Cas9 engineered STOP-IN null mutant of K03E5.2. Universal 43bp-long knock-in insertion with 3-frame stop codon (STOP-IN cassette). left flanking sequence: tatattttttgaaattttccagggaATGACCGGTT; right flanking sequence: GTCAAGGGAAAGCATTTGAAGAGAATTTGGGAGCT; inserted sequence between the two flanking sequence (STOP-IN cassette): GGGAAGTTTGTCCAGAGCAGAGGTGACTAAGTGATAAgctagc sgRNA: ATTGCTTGGCACCTCGACGG Reference: Wang H, et al. G3 (Bethesda).