LAGUNA DESIGN / SCIENCE PHOTO LIBRARY LAGUNA DESIGN / SCIENCE PHOTO LIBRARY
Hepatitis C virus enzyme, molecular model. This protein, called NS5B, forms the active site of the virus's RNA-dependent RNA polymerase enzyme. The enzyme makes RNA (ribonucleic acid) from a DNA template. Hepatitis C is a blood-borne virus causing liver damage. In this model, the solid colours represent the secondary structure of the protein (spiral ribbons are alpha helices; arrows are beta sheets), and the faded tubular structure behind represents the individual atoms and bonds.
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