A micrograph of ongoing gene transcription of ribosomal RNA illustrating the growing primary transcripts. Begin indicates the 3' end of the DNA, where new RNA synthesis begins; end indicates the 5' end, where the primary transcripts are almost complete.

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A micrograph of ongoing gene transcription of ribosomal RNA illustrating the growing primary transcripts. Begin indicates the 3' end of the DNA, where new RNA synthesis begins; end indicates the 5' end, where the primary transcripts are almost complete.