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"Effects of topical creams containing vitamin C, a copper-binding peptide cream and melatonin compared with tretinoin on the ultrastructure of normal skin." Disease Management & Clinical Outcomes , 1998

Chaturvedi K, Bandari P, Chinen N, Howells RD: Proteasome involvement in agonist-induced down-regulation of mu and delta opioid receptors

However, compounds with an amino acid-based structure (i.e., peptides, proteins, pep- tidomimetics), including those used in therapeutic applications, have a number of serious limitations, such as conformational instability, short duration of action (short half-life), and insufcient penetration through the bloodbrain barrier (BBB) [ 3 5 ]

According to Google Trends, searches for "peptides" have climbed 80 percent, while searches for "what is a peptide" are up 70 percent

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