qIs26 [lag-2::GFP + rol-6(su1006)]. or1951 is a CRISPR/Cas9 engineered mutation in cls-1 causing a frameshift and premature stop. Heterozygotes are Rollers and GFP+ in the distal tip cell, and segregate heterozygotes (WT Rol), lethal qC1 homozygotes, and or1951 homozygotes (lay 100% dead embryos). Pick WT GFP+ Rol and check for correct segregation of progeny to maintain. Reference: Schlientz AJ & Bowerman B. (2020) C. elegans CLASP/CLS-2 negatively regulates membrane ingression throughout the oocyte cortex and is required for polar body extrusion. BioRxiv.