Labeling and Protecting N -Terminal Protein Positions by β -Peptidyl Aminopeptidase-Catalyzed Attachment of β -Amino-Acid Residues - Insulin as a First Example

Labeling and Protecting N -Terminal Protein Positions by β -Peptidyl Aminopeptidase-Catalyzed Attachment of β -Amino-Acid Residues - Insulin as a First Example