Vaccine research. A scientist examining a cell culture autoradiograph, a technique which enables visually-identical cells to be discriminated by virtue of their genetic content. It is produced by labelling DNA fragments in specific cells in culture with a radioactive marker. The dishes are then placed on a sheet of X-ray film; the radioactivity produces dark spots on the film after processing. This can be used to assess the production rate of a genetically-engineered vaccine under various conditions, or to assess its effectiveness. Photographed at the Paterson Institute for Cancer Research, Manchester. Scientist is DR MICHAEL MACKETT.
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