Interferon beta

Where is Interferon Beta-1a made?

2 companies sell it under their own name. None of their labels names the factory.

Companies and their factories

Company on the labelFactoryWhereLast FDA inspection
Biogen Inc. Avonex Pen, Avonex30 ug per 0.5 mL · NDC 59627-003, 59627-002The label doesn't name the factory. Plants this company names for other drugs
EMD Serono, Inc. Rebif, Rebif Rebidose22 ug per 0.5 mL, 22 ug per 0.5 mL / 8.8 ug per 0.2 mL, 44 ug per 0.5 mL · NDC 44087-0022, 44087-3322, 44087-8822 +3The label doesn't name the factory. Plants this company names for other drugs