original: this work was accomplished through the efforts of martin evans and oliver smithies working on the knockout mice .
simplifications: this work was finished through the efforts of martin evans and oliver smithies working on the knockout mice . this work was completed through the efforts of martin evans and oliver smithies working on the genetically changed mice . this work was done by of martin evans and oliver smithies working on the knockout mice . this work was done by martin evans and oliver smithies working on the knockout mice . this work was done through the efforts of martin evans and oliver smithies working on the knockout mice . this work was accomplished through the efforts of martin evans and oliver smithies working on the knockout mice.7 . martin evans and oliver smithies completed the knockout mice . this work was completed by the efforts of martin evans and oliver smithies working on the knockout mice .