Scientist loading agarose gel to separate DNA fragments.

 
Scientist loading agarose gel to separate DNA fragments.
4 0 c m
 
34cm
actual image size: 26cm x 32cm

Description

Scientist loading agarose gel to separate DNA fragments, Great Ormond Street Hospital, London, May 2000. Scientists use a technique called gel electrophoresis to sort DNA into size order. During gel electrophoresis, an electric field pulls the pieces of DNA through a jelly-like slab: a gel. Smaller pieces move through the gel quicker and travel further than larger pieces. Scientists treat the sorted DNA pieces with a chemical that makes them show up under ultraviolet light.

© Science Museum / Science & Society Picture Library

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