Copyright information:Taken from "An efficient system to establish multiple embryonic stem cell lines carrying an inducible expression unit"Nucleic Acids Research 2005;33(4):e43-e43.Published online 1 Mar 2005PMCID:PMC552969.© The Author 2005. Published by Oxford University Press. All rights reserved EBRTcPGATA6 cells were cultivated for the indicated concentrations of Tc for 24 h and 1 × 10 cells were analyzed for the intensity of GFP fluorescence. Note that in the absence of Tc 96.9% of cells are GFP positive.