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metal prints experiment metal prints analysis metal prints equipment metal prints electrophoresis gel metal prints laboratory metal prints biochemistry metal prints biology metal prints technology metal prints genetics metal prints illustration metal prints biochemical metal prints biological metal prints no-one metal prints nobody metal prints white background metal prints

photographs experiment photos analysis photos equipment photos electrophoresis gel photos laboratory photos biochemistry photos biology photos technology photos genetics photos illustration photos biochemical photos biological photos no-one photos nobody photos white background photos

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Southern blot DNA analysis, illustration. Enzymes are used to fragment DNA (deoxyribonucleic acid). The fragments are separated in an electrophoresis gel (upper left). The separated fragments are 'blotted' (upper right) onto a nitrocellulose filter which is removed (lower left) and incubated (lower centre). The radioactive markers (red dots, lower centre) indicate the presence of specific genetic sequences. A sheet of photographic film is then laid over the filter. The radioactivity darkens the film (lower right), which reveals the position of genes in the DNA. This technique is widely used in research. For this artwork with labels, see C023/8900.

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