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2.transcription factor, molecule that controls the activity of a gene by determining whether the gene¡¯s DNA (deoxyribonucleic acid) is transcribed into RNA (ribonucleic acid). The enzyme RNA polymerase catalyzes the chemical reactions that synthesize RNA, using the gene¡¯s DNA as a template. Transcription factors control when, where, and how efficiently RNA polymerases function.
http://www.britannica.com/EBchec ... ranscription-factor
3.transcription factor, a specific protein required for the initiation of transcription by an RNA polymerase. Each polymerase has its own set of transcription factors.
Mosby's Medical Dictionary, 8th edition. © 2009, Elsevier.
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