Superficially wild-type. CRISPR/Cas9 STOP-IN null mutant of C53C9.2. lethal strain balanced with tmC30[ubc-17(tmIs1243)] X (from parental strain FX30236; dominant red pharynx and recessive Lon Mec); this strain segregates wild type, long animals, and L1 arrested homozygotes. Pick wild-type animals to maintain the heterozygotes. Universal 43bp-long knock-in insertion with 3-frame stop codon (STOP-IN cassette). left flanking sequence: CGCTGTCGGTATGCCACGTTGGAATATCACCAAGG; right flanking sequence: ACAAGAAGCAAGGATACATCGCTCCAGATCAGAGATC; inserted sequence between the two flanking sequence (STOP-IN cassette): GGGAAGTTTGTCCAGAGCAGAGGTGACTAAGTGATAAgctagc Reference: Wang H, et al. G3 (Bethesda).