DNA cloning trays. Robot arm picking a tray of bacterial colonies which clone human DNA fragments for use in the Human Genome Project. The bacteria clone (replicate) the DNA as they reproduce, which allows workable amounts of DNA to be produced. The Human Genome Project aims to find the base sequence of all the genes in human DNA. Genes are lengths of DNA (deoxyribonucleic acid) which have specific functions within an organism. Human DNA is made up of over 100,000 genes comprising some 3 billion pairs of bases. Once complete, the human genome map will allow for improved drug design and a greater understanding of genetic diseases. Phot- ographed at the Sanger Centre, Cambridge, England.

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