Homozygous fertile; reduced brood size. mex-3(spr9) is a CRISPR/Cas9 engineered deletion of the mex-3 3´UTR (removes 624 of 689 bp). Derived by modification of parental strain DG4269 mex-3(tn1753[gfp::3xflag::mex-3]) I. Reference: Albarqi MMY & Ryder SP. PLoS Genet 2021 Aug 23;17(8):e1009775. PMID: 34424904