J.C. REVY, ISM / SCIENCE PHOTO LIBRARY J.C. REVY, ISM / SCIENCE PHOTO LIBRARY
Recombinant viruses. Coloured Transmission Electron Micrograph (TEM) of a section through several adenoviruses used in gene therapy. These viruses have a red core of DNA-genetic material enclosed in an orange protein coat. These viruses have been genetically engineered and are known as recombinant viruses. They have had a section of their own DNA replaced with a human gene known as CFTR. A mutation in CFTR causes the inherited disease cystic fibrosis. Infecting a cystic fibrosis patient with one of these recombinant adenoviruses containing the "correct" CFTR gene may pave the way for gene therapy. Magnification: unknown.
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