Superficially wild type but some including Pvl or Dpy phenotypes, poor locomotion, slow growth and sometimes ruptured. CRISPR/Cas9 engineered STOP-IN null mutant of mgrn-1. Universal 43bp-long knock-in insertion with 3-frame stop codon (STOP-IN cassette). Left flanking sequence: GAGGAACACACACGAGCGGGGAAACTCGCACGATG. Right flanking sequence: ATGAGGACCCCGAAGCACAGATAACGTTCTCCAAC. Inserted sequence between the two-flanking sequence (STOP-IN cassette): GGGAAGTTTGTCCAGAGCAGAGGTGACTAAGTGATAAgctagc. sgRNA: GGGAAACTCGCACGATGATG. Method Reference: Wang H, et al. G3 (Bethesda). 2018 Nov 6;8(11):3607-3616.