Superficially wild-type. CRISPR/Cas9 engineered STOP-IN null mutant of flp-4. Universal 43 bp-long knock-in insertion with 3-frame stop codon (STOP-IN cassette). left flanking sequence: CACGTTGCTTGCACTCACAGCAGCTCATCCACCGTC right flanking sequence: ATCTGGTGAAGAAATTGCTGAGCAAGAAGAGAAG inserted sequence between the two flanking sequence (STOP-IN cassette): GGGAAGTTTGTCCAGAGCAGAGGTGACTAAGTGATAAgctagc. sgRNA: GCAGCTCATCCACCGTCATC Method Reference: G3 (Bethesda). 2018 Nov 6;8(11):3607-3616