pmcIs1 [ant-1.1p::ant-1.1::GFP + unc-119(+)]. Expression of ant-1.1::GFP under ant-1.1 promotor (Farina et al., Dev Dyn 2008) in most tissues including the gonads and in the spermatozoa. GFP intensity is low and unstable. GFP positive worms should be selected under fluorescence microscope. ant-1.1::GFP expression seems to be more stable when worms are grown at 24°C and in the dark. Reference: Al Rawi S, et al. Science. 2011 Nov 25;334(6059):1144-7.