Tysabri (tie-SAB-ree), the latest treatment for multiple sclerosis (MS)

There's a lot of excitement about Tysabri (tie-SAB-ree), the latest treatment for multiple sclerosis (MS).

Tysabri (natalizumab) is a monoclonal antibody. It blocks immune cells from entering the CNS and attacking nerves.

It seems to be more effective than the other MS drugs... but it also costs more.

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