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Chromatin configuration and total transcription level in growing and fully-grown oocytes. Chromatin was counterstained with DAPI (red). Transcription was examined by monitoring the incorporation of 5-fluorouridin into nascent RNAs (green). Note that transcription is lower in SN/NSN and SN oocytes than in NSN oocytes. DAPI, 4′,6-diamidino-2-phenylindole; SN, surrounded nucleolus; NSN, non-surrounded nucleolus. Scale bar = 30 μm.
