Heterozygotes are Unc non-Dpy and segregate Unc non-Dpy, DpyUnc and PATs. st568 is a recessive lethal causing a PAT phenotype (paralyzed embryoes, arrested elongation at 2-fold length).
stEx14 [pat-10::LacZ + rol-6(su1006)]. Pick Rollers to maintain. Animals with the extrachromosomal array are Slow Rollers. Animals which have lost the array are Pats. Strain can be propagated by chunking.