JAMES KING-HOLMES / SCIENCE PHOTO LIBRARY JAMES KING-HOLMES / SCIENCE PHOTO LIBRARY
Bacterial colony study. Technician marking radioactively-tagged bacterial colonies on an autoradiograph for the human genome project. Known human DNA (deoxyribonucleic acid) sequences with radioactive markers were introduced into colonies with unknown human sequences present. Those the marker bound to formed a dark dot on the film, giving clues to the unknown fragments' sequ- ences. The human genome project aims to find the DNA base sequences of all human genes, strands of DNA which perform specific tasks in an organism. This will allow for improved drug design and a greater understanding of genetic diseases. Photog- raphed at the Sanger Centre in Cambridge, England.
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