CAS Number: 75790-53-3 Molecular Weight: 980.56 Salt Form: TFA Purity: >95% Sequence (3-letter): Tyr-Gly-Gly-Phe-Leu-Arg-Arg-Ile-OH Sequence (1-letter): YGGFLRRI-OH Storage: -20 ?C or below Dynorphin A porcine is an endogenous opioid peptide. Dynorphin A (1-8) is a truncated analog which binds mu-, kappa-, and delta-opiod receptors.