GEOFF TOMPKINSON / SCIENCE PHOTO LIBRARY GEOFF TOMPKINSON / SCIENCE PHOTO LIBRARY
DNA electrophoresis. A scientist looking at DNA fragments in an electrophoresis gel. The fragments have been stained with ethidium bromide. This fluoresces under ultraviolet light, and makes the positions of the fragments easier to see. A face visor has to be worn to protect the eyes against the UV light.
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