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Ethics declarations Conflict of Interest Christine Duval, Jie Qiu, Emilie Warrick, Peggy Sextius, Isabelle Castiel, and Francoise Bernerd are employees of LOral

"Tripeptide in human serum which prolongs survival of normal liver cells and stimulates growth in neoplastic cells" Nature New Biology, 243:85-87 "GHK Peptide as a Natural Modulator of Multiple Cellular Pathways in Skin Regeneration" BioMed Research International, 2015:648108 "Regenerative and Protective Actions of the GHK-Cu Peptide in the Light of the New Gene Data" International Journal of Molecular Sciences, 19(7):1987 Produkt jest surowcem chemicznym przeznaczonym wycznie do zastosowa badawczych, naukowych i analitycznych in vitro

2.3 Analysis of organic compounds 2.3.1 Utilization of low-molecular weight organic acids The supernatants obtained as described in section 2.2.1 were centrifuged at 4 C, 11,000 rpm for 10 min and the resulting supernatant was used for the determination of residual contents of salicylic acid, phthalic acid, gentisic acid, protocatechuic acid and catechol by ultraviolet spectrophotometry at 296 nm, 292 nm, 320 nm, 320 nm, and 275 nm, respectively ( 2.3.2 Utilization of BaP The amount of BaP remaining in the culture supernatants obtained from the experiments described in 2.2.2 was determined by GCMS (Aglient 7890/5975c) as described in the literature ( 1 to 140 C