Superficially wild-type. CRISPR/Cas9 STOP-IN null mutant of cpn-4 (F49D11.8). Universal 43bp-long knock-in insertion with 3-frame stop codon (STOP-IN cassette). left flanking sequence: GGCAAGCAAGTTCAATGATGTTGAAGCTGGATACT; right flanking sequence: TGTTGGAATGGATTCGGgtaagatttgggtagatt; inserted sequence between the two flanking sequence (STOP-IN cassette): GGGAAGTTTGTCCAGAGCAGAGGTGACTAAGTGATAAgctagc Reference: Wang H, et al. G3 (Bethesda).