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Abstract
A procedure for the production of [14C]protein A is described which involves reductive
methylation of lysine residues with [14C]formaldehyde and NaCNBH3. The binding of
[14C]protein A to IgG is apparently unaltered, as determined by competitive binding
studies. The use of [14C]protein A may be preferred to that of 125I-protein A when
a radioactive label with a long half-life is desirable.