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RNA polymerase transcribing DNA into RNA, illustration
Illustration of RNA polymerase (blue) in the nucleus in the process of transcription. It unwinds the DNA (deoxyribonucleic acid) double helix (violet), and uses its nucleotide sequence as a template to produce a strand of complementary messenger ribonucleic acid (mRNA, red)., by JUAN GAERTNER/SCIENCE PHOTO LIBRARY
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