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25.9 x 19.1 cm ⏐ 10.2 x 7.5 in (300dpi)
SPENCER SUTTON / SCIENCE PHOTO LIBRARY SPENCER SUTTON / SCIENCE PHOTO LIBRARY
Illustration of an ames test procedure which uses bacteria to test whether a given chemical can cause mutations in the DNA of the test organism, in this case a rat liver. From left to right: rat liver extract (at bottom mixed with mutagen), next is a media lacking histidine, then the incubation period, and finally a control plate (at top) and an experimental plate (at bottom).
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