ar221 is a tra-2 ts allele. Strain will grow at 15C as Egl hermaphrodites. When grown at 25C, all animals mature into X males, many of which are fertile. Good source of pure XX mating males. ar221 isolated by Jane Hubbard.

rdIs4 [ehn-3a::Venus(delta)]. Temperature-sensitive. Must be maintained at 15°C to produce progeny. Strain develops as hermaphrodites at 15°C (some animals are intersex with male tails), and develops as XX pseudomales at 25°C. GFP expressed in gonadal precursors. Reference: Kroetz MB & Zarkower D. G3 (Bethesda). 2015 Oct 23;5(12):2831-41.