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{short description of image}Image Number K9298-1 Chemist Betty Burri and biologist Terry Neidlinger compare models of tracer beta-carotene and natural beta-carotene. The tracer model (held by Burri) contains deuterium atoms (red) in place of some hydrogen atoms. Photo by Scott Bauer.  640 pixels wide: (k9298-1.jpg)   Please visit our Image Gallery


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