Apparent homozygous lethal or sterile deletion as unbalanced heterozygote. Homozygotes are scrawny, grottty animals that appear internally disorganized and are sterile if they reach adulthood. Deletion of 3326 bp with Calarco/Colaiacovo selection cassette conferring myo-2::GFP and G418 resistance inserted at break. Pick viable fertile GFP+ animals to maintain. Please refer to supporting documents linked to the strain name in the CGC Strain Information display. Left flanking sequence: TTTTTTTTCTCAAAAGCGAAAAAATTTCCT. Right flanking sequence: AGGATCAGAATCCAAAAAATCGTGAAAAAA. Please reference Au et al., G3 9(1): 135-144 2019 in any work resulting from use of this mutation.