US Patent 7208148 Chemically modified cytokines

The invention concerns a derivative of viral regulatory protein or a fragment of viral regulatory protein or of the alpha interferon or a fragment of alpha interferon, which is carboxymethylated, a method for preparing, use of the resulting product in a method of treatment for the human or animal body, a pharmaceutical composition and a vaccine containing as active principle, at least one of the carboxymethylated proteins or fragments.