“Our motivation was to diversify and de-risk the company to move forward; and for the patients to continue to benefit from the profound efficacy of Tysabri. The risk of one asset and a single collaborator was not ideal”.Mr. Martin concluded, “Over the past twelve years, Biogen Idec has been a terrific collaborator. I would like to personally thank them for their professionalism, sincere focus on patient care and our corporate relationship overall. As we move into the future, we look forward to participating in Tysabri’s success over the intermediate and long term as it continues to provide benefit to patients who suffer from relapsing remitting MS. Additional life cycle opportunities in secondary progressive MS and/or other non-MS indications may represent further advancements for patient choice and broad utilization of this unique therapeutic asset.” Conditions The transaction has been approved by the boards of directors of both companies and is subject to the customary review process under the Hart-Scott-Rodino Antitrust Improvements Act in the United States, other customary review processes and closing conditions. The transaction is expected to close by the end of the second quarter 2013. Advisors Citi and Ondra Partners are acting as financial advisors to Elan. Cadwalader, Wickersham & Taft LLP and A&L Goodbody are acting as legal counsel to Elan. Webcast Elan are hosting a webcast to discuss full -year 2012 financial results today, February 6, 2013 at 8.30am EST/1.30pm GMT and the Tysabri restructuring transaction will be discussed during the call. Live audio of the conference call will be simultaneously broadcast over the Internet and will be available to investors, members of the news media and the general public. This event can be accessed by visiting Elan’s website at www.elan.com and clicking on the Investor Relations section, then on the event icon. Following the live webcast, an archived version of the call will be available at the same URL. About Tysabri TYSABRI is approved in more than 65 countries. TYSABRI is approved in the United States as a monotherapy for relapsing forms of MS, generally for patients who have had an inadequate response to, or are unable to tolerate, an alternative MS therapy. In the European Union, it is approved for highly active relapsing-remitting MS (RRMS) in adult patients who have failed to respond to beta interferon or have rapidly evolving, severe RRMS.