Taq ruling may not amplify

A U.S. District Court has ruled that F. Hoffmann-La Roche Ltd.'s U.S. patent covering native Thermus Aquaticus (Taq) DNA polymerase is unenforceable and therefore in the public domain. But the pharma company maintains that the decision has little bearing on its PCR franchise, becuase the enzyme is predominantly sold in recombinant forms.

The ruling comes in a suit brought by Roche against

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