A plant produced chimeric polypeptide is provided. The plant produced chimeric polypeptide comprising:(i) a first domain which comprises a TNF Alpha binding domain of a TNF receptor, and(ii) a second domain which comprises an Fc domain of an immunoglobulin, wherein the first domain and the second domain are N-terminally to C-terminally respectively sequentially translationally fused and wherein the chimeric polypeptide specifically binds TNF Alpha.