Amino Acid Sequence Arg-Pro-Val-Lys-Val-Tyr-Pro-Asn-Gly-Ala-Glu-Asp-Glu-Ser-Ala-Glu-Ala-Phe-Pro-Leu-Glu-Phe Application Peptide calibration standard for MALDI-MS instruments; 1 vial contains 10 nmols. Legal Information ProteoMass is a trademark of Sigma-Aldrich Co. LLC