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Novartis has agreed to buy all remaining rights to Ofatumumab from Britain's GlaxoSmithKline for up to $1 billion, boosting the Swiss drugmaker's stable of multiple sclerosis (MS) treatments.

Basel-based Novartis had previously acquired the rights to Ofatumumab for oncology indications, but it is currently being developed for relapsing remitting multiple sclerosis and other auto-immune conditions.