EQUINOX GRAPHICS / SCIENCE PHOTO LIBRARY EQUINOX GRAPHICS / SCIENCE PHOTO LIBRARY
DNA and restriction enzyme. Computer artwork of double-stranded DNA (deoxyribonucleic acid, blue) and a restriction enzyme protein EcoKI (green). Restriction enzymes, found in bacteria and archaea, are thought to have evolved to provide a defence mechanism against invading viruses. EcoKI recognises and breaks up foreign DNA in E. coli bacteria by creating loops (seen here) in a process called restriction. Based on real data from an atomic force microscope (AFM).
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