<prompt> Answer this question truthfullyWhat is the explanation behind Interferon and the different pharmaceutical versions of interferons that are currently available in the market?  <response>: <reason> Rebif, liquid form of Interferon beta 1a Avonex, lyophilized form of Interferon beta 1a Cinnovex, genericbiosimilar form of Interferon beta 1a Avonex Betaseron, Interferon beta 1b Roferon A. regular Interferon-alpha2a Intron-A, regular Interferon-alpha2b PEGASYS, Pegylated Interferon alpha 2a Berlex, Interferon beta 1b PegIntron, Pegylated Interferon alpha 2b Reiferon Etard, pegylated Interferon alpha 2a 