“…α ‐Lysine (Fig. 1) occur in various biologically active peptides, for example, in the active portions of adrenocorticotropic hormones (1), melanotropic hormones (2), thrombolytically active therapeutic agents such as P6A (obtained from fibrinogen degradation; 3–5), adhesive proteins of marine mussel (6,7), chemotactic peptides (8), biocompatible telomers (9), hybrid peptides (10), and analogs‐like somatostatin (11). Consequently, considerable efforts have had been made to incorporate Lys residues in the peptide chain extension.…”