Superficially wild-type. CRISPR/Cas9 engineered STOP-IN null mutant of Y55F3BL.4; Universal 43bp-long knock-in insertion with 3-frame stop codon (STOP-IN cassette). Left flanking sequence: GAAGACGACGGATTCACCCTGGTCACTGGTAGAAA Right flanking sequence: AGCCGGAAAACAGTCGGCGAAATTTgtcagttttc inserted sequence between the two flanking sequence (STOP-In casette): GGGAAGTTTGTCCAGAGCAGAGGTGACTAAGTGATAAgctagc. sgRNA : CTGGTCACTGGTAGAAAAGC Method Reference: G3 (Bethesda). 2018 Nov 6;8(11):3607-3616