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Cell viability of human epidermal keratinocytes (HEKa) treated with different concentrations of (A) jellyfish and calf skin collagen (JC and VC); (B) collagenase-hydrolysed fraction containing peptides with MW ranging 10–30 kDa (HJCp 10–30 and HVCp 10–30), (C) MW 3–10 kDa (HJCp 3–10 and HVCp 3–10) and (D) MW < 3 kDa (HJCp < 3 and HVCp < 3). Data are mean values ± SD of six independent experiments. Statistical analysis performed with ANOVA and Dunnett’s test (p < 0.05).
