The transition from abortive to productive transcription may occur at bp +5. The primary transcripts of pol III-transcribed genes are short, ~90 to 120 nt for tRNA and 5s RNA genes (which constitute the great majority of products) and even the longest transcripts (e.g. the RNA of the signal recognition particles) are only ~500 nt. This event is inferred from an event in Saccharomyces cerevisiae.
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