Here is the Biogen press release.
http://www.biogenidec.com/site/news-and ... PR_184.htm
Further mergers in this sector wouldn't surprise me. It's difficult to work out who owns who. Merck now own Serono. Campath (my tipple) was invented at Cambridge University, then sold to Ilex Oncology, now owned by Genzyme, and Bayer also seem to have some involvement! Many of Biogen's products e.g. Rituximab seem to be jointly owned with other companies.
Hope you are well. I know you like dabbling on the stock market but (my advice) don't buy shares in a UK bank called Northern Rock.