3xV5 epitope tag inserted into endogenous lst-1 locus with a 1 bp deletion in lst-1L-specific first exon tospecifically disrupt LST-1L isoform. Synthetically sterile in combination with sygl-1(lf). Reference: Haupt KA, et al. 2019 Oct 17;146(20):dev181644. PMID: 31515205.