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(a) Transamination of the N-terminal amine by pyridoxal phosphate (PLP) and reactivities of different amino acids [101]. (b, c) Modification of protein N-termini by pyridine aldehyde and the formation of imidazolidinone [102]. Adapted with permission from Witus et al. [101]; MacDonald et al. [102]. Copyright © 2014, John Wiley and Sons; Copyright © 2014, Springer Nature.
