DR GOPAL MURTI / SCIENCE PHOTO LIBRARY DR GOPAL MURTI / SCIENCE PHOTO LIBRARY
Gene splicing. Coloured transmission electron micrograph of genetically engineered DNA plasmids from the bacteria Escherichia coli. The plasmids (yellow) have had different gene sequences (various colours) spliced into them. Plasmids are symbiotic pieces of DNA (deoxyribonucleic acid) that occur in bacteria and yeast. They are separate from the main chromosome, replicate independently, and can be transferred from one cell to another carrying genes with them. This property of plasmids is exploited in genetic engineering. In gene therapy, plasmids with beneficial genes are inserted into human cells by viruses. Magnification: x24,600 at 6x4.5cm size.
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