We can synthesize peptides of lengths up to ~80 residues. Peptide lengths of 10 to 70 residues can usually be made by direct SPPS chemical synthesis. Depending upon the scale and future requirements, combined strategies of using solution fragment condensation or even hybrid methods involving solid-phase couplings of protected peptide fragments may be developed specifically for each product. We also can utilize native chemical ligation to make longer peptides and potentially mini-proteins using fully deprotected peptide fragments with an N-terminal Cys residue and another fragment containing a C-terminal thioester.
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