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Peptides we discuss

Stylized models built from each sequence.

BPC-157

GEPPPGKPADDAGLV

Gly-Glu-Pro-Pro-Pro-Gly-Lys-Pro-Ala-Asp-Asp-Ala-Gly-Leu-Val

15 residues
KPV

KPV

Lys-Pro-Val

3 residues

alpha-MSH (11-13)
TB-500 (Ac-LKKTETQ fragment)

Ac-LKKTETQ

Ac-Leu-Lys-Lys-Thr-Glu-Thr-Gln

7 residues, N-acetylated

Residues 17 to 23 of thymosin beta-4. Not full-length thymosin beta-4.
MOTS-c

MRWQEMGYIFYPRKLR

Met-Arg-Trp-Gln-Glu-Met-Gly-Tyr-Ile-Phe-Tyr-Pro-Arg-Lys-Leu-Arg

16 residues
Epitalon

AEDG

Ala-Glu-Asp-Gly

4 residues
Semax

MEHFPGP

Met-Glu-His-Phe-Pro-Gly-Pro

7 residues
Retatrutide

Y-Aib-QGTFTSDYSI-αMeLeu-LDK-K(lipid)AQ-Aib-AFIEYLLEGGPSSGAPPPS-NH2

Tyr-Aib-Gln-Gly-Thr-Phe-Thr-Ser-Asp-Tyr-Ser-Ile-αMeLeu-Leu-Asp-Lys-Lys(lipid)-Ala-Gln-Aib-Ala-Phe-Ile-Glu-Tyr-Leu-Leu-Glu-Gly-Gly-Pro-Ser-Ser-Gly-Ala-Pro-Pro-Pro-Ser-NH2

39 residues, C-terminal amide
- Positions 2 and 20 are Aib (2-aminoisobutyric acid), not alanine.
- Position 13 is alpha-methyl-L-leucine (αMeLeu), not leucine.
- Lysine 17 is lipidated: its N6 side chain carries a C20 fatty diacid linked through gamma-glutamate and an AEEA spacer.
- The C-terminus is a serine amide (Ser-NH2), not a free acid.