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Feb 14, 2012
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carbon 13




the stable isotope of carbon having an atomic mass number 13, used as a tracer. Also,car•bon-13Pronunciation: (kär'bun thûr-tēn'). [key]

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

carbon 12carbon 14
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