An interferon beta-1 subtype that has a methionine at position 1, a cysteine at position 17, and is glycosylated at position 80. It functions as an ANTI-VIRAL AGENT and IMMUNOMODULATOR and is used to manage the symptoms of RELAPSING-REMITTING MULTIPLE SCLEROSIS.

Synonyms: 0, Interferon beta 1a, Interferon beta-1a, Avonex Pen, XRO4566Q4R, Avonex, beta 1a, Interferon, beta-1a, Interferon, Rebif