http://www.corante.com/brainwaves/archives/2005/02/28/multiple_sclerosis_drug_tysabri_pulled_off_market.php Biogen Idec and Elan announced Monday they have voluntarily withdrawn Tysabri, a drug used to treat multiple sclerosis, after one patient died and another developed a serious disease of the central nervous system after taking it in combination with Avonex... en-us http://hyscience.typepad.com/hyscience/2005/02/multiple_sclero.html Biogen Idec and Elan announced Monday they have voluntarily withdrawn Tysabri, a drug used to treat multiple sclerosis, after one patient died and another developed a serious disease of the central nervous system after taking it in combination with Avonex