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The ribosome translates region 1 while RNA polymerase transcribes region 3.

The ribosome does not stall at the Trp codons, because tryptophan is abundant.

^ The leading edge of the ribosome covers part of region 2, preventing it from pairing with region 3.

^ Region 4 is transcribed and pairs with region 3. The pairing of regions 3 and 4 produces the attenuator that terminates transcription.

When tryptophan is low

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