 One of these antibodies, mAb806, was originally made from mouse protein. Because mAb806 is a mouse antibody, if it were given to humans the body would see it as a foreign protein and would be likely to react to it with an unwanted immune response. To overcome this, the structure of the original mouse antibody called mAb 806 was changed to appear more human-like. And the chimeric antibody part mouse part human called ch806 was produced. 