Levels of transcription from three important GR untranslated first exons. Shown are expression levels of transcripts from, top to bottom, GR exons 1A3, 1D, and 1C, expressed in relative fluorescence units (RFU). RNA was quantified using real-time PCR as outlined in Materials and Methods. The cell line or clone being tested is indicated along the abscissa. White bars, treatment with ethanol vehicle; black bars, with Dex.