By Doug Macron

Alnylam Pharmaceuticals this week filed a patent-infringement lawsuit against partner Tekmira Pharmaceuticals, marking the latest action in a protracted legal battle between the companies over the rights to key lipid-based RNAi drug-delivery technologies.

In the suit, Alnylam and co-plaintiff Isis Pharmaceuticals allege that Tekmira provided lipid nanoparticle-formulated siRNAs to collaborator Bristol-Myers Squibb in violation of a number of patents to which Alnylam claims exclusive rights.

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