SAM OGDEN / SCIENCE PHOTO LIBRARY SAM OGDEN / SCIENCE PHOTO LIBRARY
DNA chip. Gloved hand holding a device for rapidly analysing samples of DNA (Deoxyribonucleic Acid) at the scene of a crime. The device (the "DNA chip") is made of clear plastic. Narrow channels have been etched on the plastic by techniques similar to those used to make electronic microchips. Samples containing fragments of DNA are put in the channels. The fragments move apart when an electric current is applied (electro- phoresis), allowing the DNA's composition to be analysed. This device is suitable for genetic linkage studies & clinical diagnostics as well as forensic investigation. It was developed at the Massachusetts Institute of Technology (MIT), USA.
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