(B) Representative Northern blot analysis (blot and gel at top) performed with RNA isolated from BAT to detect UCP-1 transcript at baseline (RT) and after 5 h of exposure to cold (4 °C) (UCP1). Ethidium bromide (Eth Br) staining of ribosomal RNA is shown as a control. Quantitative real-time RT-PCR for UCP-1 transcript is shown on the graph at the bottom. The values represent mean arbitrary units normalized to a 36B4 transcript (control).