This time they took a kiwi-fruit allergen called thaumatin-like protein—which they knew would degrade quickly in the sto这次，他们取一种称作索马丁样蛋白的猕猴植物过敏原（研究人员知道过敏原本身在胃中会很快被分解），并将其与果胶混合在一起加入到人工合成的胃内容物之中。