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Inhibition of in vitro collagenase activity by 1,10-phenanthroline (positive control) and by peptides (2–10 kDa) at final concentrations of 50, 250, 500, and 1000 µg/mL. Data are presented as means ± SD (error bars) from three independent measurements. Different letters (a–d) indicate significant differences (p < 0.05) between the peptide concentrations tested (50–1000 µg/mL).
