1.Instead, their test tube was filled with some "contaminant": A high molecular weight polymer they would soon identify as the first actin-binding protein, later called filamin A.

1.另一方面，他们充满了一些“污染物”：一种他们即鉴别，相当于第一个肌动白白高分子质量聚物，后来被称为细丝白A。