| Amino Acid Sequence Tyr-Pro-Phe-Phe-NH2
 Biochem/physiol Actions
 Potent, selective endogenous μ opioid receptor agonist.
 Legal Information
 Sold under license to US patent number 6,303,578
 Other Notes
 Tandem Mass Spectrometry data independently generated by Scripps Center for Metabolomics is available to view or download in PDF.  E3148.pdf  Tested metabolites are featured on Scripps Center for Metabolomics METLIN Metabolite Database. To learn more, visit sigma.com/metlin.
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