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Accordingly, peptides discussed in this review fall into two broad groups: first, bioactive peptides originating from food proteins, endogenous biological systems, or laboratory synthesis, typically comprising 2 50 amino acids

The blue color comes from the complex of the copper(II) ion with the GHK tripeptide and is a natural feature of the properly complexed GHK-Cu form

References 1 Journal of Clinical Endocrinology & MetabolismTeichman et al

The tumor-suppressive effect of miR-29a-3p was thoroughly assessed using several independent public datasets, proprietary patient cohorts, in vitro tests using macrophages, fibroblasts, and tumor cells, and in vivo models