otIs545 [gcy-5p::RFP + LacO repeats]. otIs593 [let-858p::GFP::LacI + ttx-3p::mCherry]. Maintain at 20C; otIs545 is very unstable at lower temperatures. RFP expression in ASER neuron. LACI::GFP aggregates on LacO repeats to form two dots in every nucleus. otIs545 is unstable, presumably due to the highly repetitive nature of the LacO array. Stock should be periodically examined for RFP expression and GFP localization to retain expression of the array. Reference: Patel T & Hobert O. eLife 2017.