β-Amyloid (1-40), Human Sequence (one letter code) DAEFRHDSGYEVHHQKLVFFAEDVGSNKGAIIGLMVGGVV Sequence (three letter code) H-Asp-Ala-Glu-Phe-Arg-His-Asp-Ser-Gly-Tyr-Glu-Val-His-His-Gln-Lys-Leu-Val-Phe-Phe-Ala-Glu-Asp-Val-Gly-Ser-Asn-Lys-Gly-Ala-Ile-Ile-Gly-Leu-Met-Val-Gly-Gly-Val-Val-OH Formula C194H295N53O58S Cas No. 131438-79-4 Purity >90%,>95%,>98% Molecular weight 4329.90