I would like to compliment Rex Dalton on his summary of the broad range of applications of GeneAmp polymerase chain reaction (PCR) technology (The Scientist, April 17, 1989, page 1). However, I most strongly disagree with the article's implication that Cetus Corp. has prevented scientists from conducting research using PCR technology or interfered with "freedom of scientific thought."

Academic scientists the world over have rapidly adopted PCR as a tool in their research efforts. Scientists at Cetus have collaborated with many university scientists, helping them to become proficient with PCR and to incorporate this profoundly useful technology into their scientific work. Nearly 400 papers already have been published citing PCR. These contributions to the literature clearly demonstrate that Cetus is not impeding scientific progress. The breadth and significance of these reports are a source of profound satisfaction to everyone at Cetus, especially to the scientists who have been...

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