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Which of this element is not orientation independent?

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Which of this element is not orientation independent?

(a) Enhancer

(b) Silencer

(c) Upstream activating element

(d) Promoter proximal elements

The question was asked in a job interview.

My question comes from Transcription in Eukaryotes : Activators and Repressors in division Gene Expression : Transcription Prokaryotes of Cytogenetics

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Right answer is (d) Promoter proximal elements

The best I can explain: While upstream activating element is orientation independent, enhancers and silencers are position as well as orientation independent. On the other hand promoter proximal elements are orientation dependent.

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