The basic distinguishes is structure. Peptides are smaller than proteins. Traditionally, peptides are defined as molecules that consist of between 2 and 50 amino acids, whereas proteins are made up of 50 or more amino acids. Let’s make it more specifically for some examples, Melanotan 2, abbreviation as MT2. From it’s full chemical sequence: Ac-Ser-Tyr-Ser-Nle-Glu-His-D-Phe-Arg-Trp-Gly-Lys-Pro-Val-NH2, we can know that MT2 has 13 amino acids, so MT2 is a peptide. We also call it a peptide hormone. Another peptide BPC-157, chemical formula: Gly-Glu-Pro-Pro-Pro-Gly-Lys-Pro-Ala-Asp-Asp-Ala-Gly-Leu-Val, with 15 amino acids, so apparently BPC-157 is also peptide.

MT-2 peptide

Melanotan 2 (also referred to as Melanotan II) is a synthetically produced variant of a peptide hormone naturally produced in the body that stimulates melanogenesis, a process responsible for pigmentation of…

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