Word: livers
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...studies under way at the Food and Drug Administration. Scientists there had found that the polyurethane foam coating surrounding the Meme and Replicon brands of implants could break down in the body into a substance called 2-toluene diamine, or TDA. This chemical had been shown to cause liver cancer in laboratory rats. The most alarming news reports claimed that TDA could trigger cancer in as many as 4 in 10,000 women who received the implants...
What are we, chopped liver...
This flew in the face of popular scientific belief, which held that all hepatocytes were similar, and therefore proved that there is in fact genetic variation among liver cells...
Based on these findings, Michaelson concluded that "changes in the overall synthesis of each plasma protein are mediated by selective growth and death among these specialized cells in the liver. In short, plasma protein synthesis fits our description of the Darwinian process, organized by cellular selection among a diverse collection of specialized cells...
Michaelson said that this idea of natural selection in the liver suggests the same process in the embryonic development of all organs...