gaSi300 [rps-0p::YFP-DD + Cbr-unc-119(+)] I. Expresses YFP tagged at the C terminus with a destabilizing domain (ecDHFR, mutated to function at 20C). YFP expression is absent in normal culture conditions, but expressed in the presence of the stabilizing ligand trimethoprim. Reference: Cho U, et al. PLoS One. 2013 Aug 22;8(8):e72393.