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Gilead Sciences (GILD) has accused the U.S. government of breaching several contracts and “secretly” obtaining patents stemming from research that led to the ground-breaking Truvada HIV-prevention pill.

In a lawsuit filed late Friday, the drug maker claimed the Centers for Disease Control and Prevention violated the terms of a 15-year-old collaboration by failing to notify the company of patents that were later sought and awarded on the research.

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