LAGUNA DESIGN / SCIENCE PHOTO LIBRARY LAGUNA DESIGN / SCIENCE PHOTO LIBRARY
Transcription repressor protein and DNA, molecular model. The repressor protein (green) is binding to a strand of DNA (deoxyribonucleic acid, pink and purple). It acts by physically blocking access to the DNA, preventing the transcription of the genetic information. This protein is from the Rex-family of repressors, and is from the bacterium Streptococcus agalactiae.
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