| http://www.w3.org/ns/prov#value | - Res. Comm., 77, 581-585 (1977).Attachment of the metal ion to a protein such as an antibody has been achieved by complexation by an acyclic chelate such as carboxymethylated amine derivatives of ethylenediaminetetraacetic acid (EDTA) (U.S. Pat. No. 4,662,420) ordiethylenetriaminepentaacetic acid (DTPA) (U.S. Pat Nos. 4,479,930 and 4,454,106), covalently linked to the antibody.
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