e/Carbon label

Information
has gloss	eng: Carbon label is a form of isotopic labeling where a carbon-12 atom has been replaced with either a carbon-13 atom or a carbon-14 atom in a chemical compound so as to tag (i.e. label) that position of the compound to assist in determining the way a chemical reaction proceeds i.e. the reaction mechanism.
lexicalization	eng: Carbon label
instance of	(noun) one of two or more atoms with the same atomic number but with different numbers of neutrons isotope