Copyright information:Taken from "An SOS-regulated operon involved in damage-inducible mutagenesis in "Nucleic Acids Research 2005;33(8):2603-2614.Published online 10 May 2005PMCID:PMC1092274.© The Author 2005. Published by Oxford University Press. All rights reserved RNAs were extracted from exponentially growing and wild-type cells before and 45 min after irradiation with 60 J/m UVC. Relative levels of expression shown represent the average of two independent experiments done in triplicate.