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Ameren owns rate-regulated generation, transmission, and distribution networks that deliver electricity and natural gas through the company's two main subsidiaries, Ameren Missouri and Ameren Illinois. It serves 2.5 million electricity customers and approximately 1 million natural gas customers accross its two service territories.
Biogen and Idec merged in 2003, combining forces to market Biogen's multiple sclerosis drug Avonex and Idec's cancer drug Rituxan. Today, Rituxan and next-generation antibody Gazyva (oncology) and Ocrevus (multiple sclerosis) are marketed via a collaboration with Roche. Biogen markets several multiple sclerosis drugs including Plegridy, Tysabri, Tecfidera, and Vumerity. Biogen's newer products include Spinraza (SMA, with partner Ionis), Leqembi (Alzheimers, with partner Eisai), Skyclarys (Friedreich's Ataxia, Reata), Zurzuvae (postpartum depression, Sage), and Qalsody (ALS, Ionis). Biogen has several drug candidates in phase 3 trials in neurology, immunology, and rare diseases.