(Gly21)-Amyloid β-Protein (1-42)是Aβ42的弗兰德变种(A21G)，它显示出减弱的聚集特性以及减弱的神经毒性。跟野生型Aβ42相比，(Gly21)-Amyloid β-Protein (1-42)被脑啡肽酶的降解速度明显较慢，因此其具有致病性。

序列(三字母)：H-Asp-Ala-Glu-Phe-Arg-His-Asp-Ser-Gly-Tyr-Glu-Val-His-His-Gln-Lys-Leu-Val-Phe-Phe-Gly-Glu-Asp-Val-Gly-Ser-Asn-Lys-Gly-Ala-Ile-Ile-Gly-Leu-Met-Val-Gly-Gly-Val-Val-Ile-Ala-OH
序列(单字母)：DAEFRHDSGYEVHHQKLVFFGEDVGSNKGAIIGLMVGGVVIA
别名：Amyloid β-Protein (1-42) Flemish Mutation, Amyloid β-Protein (1-42) A21G, Amyloid-beta Peptide (1-42), A21G, Human, Amyloid-beta Protein (1-42) (human), Flemish Mutation, [Gly21] - beta - Amyloid (1 - 42), [Gly21]-Abeta (1-42), Human
分子式:C202H309N55O60S
分子量:4500.08
合成方法：Synthetic
存储条件：-20 °C，避光，干燥
应用：Alzheimers Disease