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The relative retention time (RRT) calculated by comparison of the HPLC retention time of each peptide to Pep05. The RP-HPLC retention time of each peptide was used to calculate the relative retention time (RRT) with respect to Pep05. No significant changes were observed for the synthetic derivatives (0.9–1.0), with the exception of DP05 (0.89), DP06 (0.81), and UP09 (1.08).
