LAGUNA DESIGN / SCIENCE PHOTO LIBRARY LAGUNA DESIGN / SCIENCE PHOTO LIBRARY
DNA helicase. Molecular model of a helicase molecule from the SV40 virus. Helicases are enzymes that separate the two strands of the DNA double helix, by breaking the hydrogen bonds between nucleotide bases. Separation of the strands is needed for replication, and therefore this protein is vital for the ability of the virus to infect host cells.
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