50.1 MB (1.9 MB compressed)
5117 x 3425 pixels
43.4 x 29.0 cm ⏐ 17.1 x 11.4 in (300dpi)
H. RAGUET / EURELIOS / SCIENCE PHOTO LIBRARY H. RAGUET / EURELIOS / SCIENCE PHOTO LIBRARY
Recombinant virus research. Researcher holds a vial of genetically-engineered (recombinant) viruses in a high-security laboratory. Viruses can be used as vectors for introducing new genes into cells. Once a virus infects a cell it inserts its own genes (DNA) into the cell's genetic material, causing it to produce more viruses. The virus can be genetically-engineered so that when it infects a cell, it inserts DNA that causes the cell to produce a specific chemical. Bacteria may be infected to produce novel chemicals, whilst the virus may be used on humans (gene therapy) to make their cells produce an essential chemical & so cure a disease.
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