| http://www.w3.org/ns/prov#value | - For example, peptides can be labeled with a radioactive isotope through use of a chelating agent or by covalent labeling with a material capable of direct reaction with a peptide (such as iodine), as well as by direct labeling (substitution of a radioactive isotope, such as 14C or tritium, for an atom present in the peptide).
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