Proteins from dinosaur fossils are used by InGen as a source for the genetic code. The protein code can give a glimpse of what the DNA code looked like. In the novels the subject is only briefly touched upon, and in the films it is never directly mentioned. In both media, DNA in Amber is the main source of genetic material; proteins were only "backup". At the time that the novel was written, the presence of proteins in fossils was scientifically controversial. For a long time most scientists believed that fossils had lost all of its biological material. This view only began to change in 2007 after soft-tissue vessels and proteins were discovered in a T. rex bone.
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