DNA fingerprinting. A scientist checking the progress of gel electrophoresis of a sample of DNA. The DNA is split into fragments chemically, and placed in solution. This is then introduced into a gel, across which is applied an electrical potential. The fragments then migrate across the gel at a rate in proportion to their mass. By adding a fluorescent marker chemical to the solution, the progress of the separation may be seen. A comparison of the pattern of fragments between samples is the basis of DNA fingerprinting. Photographed at the UK Government's Home Office Forensic Science Service at Aldermaston, England.
Model release not available. Property release not required.