“GHK, the Human Skin Remodeling Peptide, Induces Anti-Cancer Expression of Numerous Caspase, Growth Regulatory, and DNA Repair Genes”. Journal of Analytical Oncology, vol. 3, no. 2, Apr. 2014, pp.  79-87, https://doi.org/10.6000/1927-7229.2014.03.02.2.