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29. | Enhancers are special cis-acting DNA sequences that increase the rate of transcription by RNA polymerase. Which of the following is true regarding enhancers? | |
A. | 10 nucleotide upstream elements | |
B. | 25 nucleotide downstream elements | |
C. | present closer or 1000s nucleotide upstream or downstream of TSS | |
D. | All of the above | |