| http://www.w3.org/ns/prov#value | - In other embodiments, protecting groups may used that are removable by chemical methods, such as FMOC, DMT and other methods known to those of skill in the art. [0094] In some embodiments, the di-nucleophilic compound is a peptide that has at its amino terminus a Cys, Ser, or Thr residue which can undergo the trans-esterification reaction with the polypeptide to be immobilized.
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