The four investigated peptides were manually synthesized by Fmoc solid phase peptide synthesis. Pep1 and pep4 were synthesized on a 2-Chlorotrityl chloride resin, while pep2 and pep3 were synthesized on rink amide resin (0.25 mmol each). The amino acids (5 equiv) were activated by mixing with a DIEA/HATU mixture (4 equiv and 3.9 equiv, respectively) for 4 min. The coupling of the amino acids was carried out for 1 h and confirmed using a Kaiser test. The Fmoc protecting groups were removed using 20% piperidine in DMF for 20 min. The resin was washed between steps twice with DMF, methanol, DCM, and again with DMF. For pep2 and pep3, acetylation was performed by mixing the resin in a DMF solution with acetic anhydride and DIEA (50 equiv each) for 30 min. The capping was also confirmed using a Kaiser test. The cleavage reaction was performed by mixing with a TFA/TIPS/water mixture (38:1:1) for 3 h. The cleaved solution was evaporated, precipitated with diethyl ether, and centrifuged. The peptide product was dissolved in water and lyophilized.