JAMES KING-HOLMES / ICRF / SCIENCE PHOTO LIBRARY JAMES KING-HOLMES / ICRF / SCIENCE PHOTO LIBRARY
Gene therapy research. Dr Richard Vile (left) and Dr Ian Hart examine test tubes in which a blue colour change indicates melanoma cancer cells that have been "switched on" to express a marker gene. Healthy cells (yellow) have been treated in the same way, but remain "switched off". This demonstrates that the melanin-producing cancer cells can be specifically targeted and activated. The two scientists from the Imperial Cancer Research Fund in London, UK, now aim to use the genetic switch to express an anti-cancer gene which will help the body to destroy the melanoma cancer cells. Photographed in February 1993.
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