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Table 1 Classes of approved recombinant-protein drugs [1].

From: Current Status of Biosimilar Growth Hormone

Class Examples
Hormones Insulin (e.g., Humulin), glucagon (e.g., Glucagen), human growth hormone (e.g., Humatrope), thyrotropin (Thyrogen), follicle-stimulating hormone (Gonal-F), lutelnizing hormone (lutropin alfa [Luveris]), human chorionic gonadotropin (Ovidrel), erythropoietin (e.g., epoctin alfa [Epogen])
Cytokines Interferon alfa (e.g., Roferon-A), granulcyte-colony-stimulating factor (filgrastim [Neupogen]), interleukin (e.g., aldesleukin [Proleukin])
Clotting factors Factor VII (NovoSeven), factor VIII (e.g., Kogenate), factor IX (BeneFIX)
Monoclonal antibodies Antibodies to vascular endothelial growth factor (bevacizumab [Avastin]), epidermal growth factor receptor (cetuximab [Erbitux]), GPIIb/IIIa receptor (abciximab [ReoPro]), CD20 (rituximab [Rituxan]), and TNF-α (e.g., infliximab [Remicade])
Vaccine products Hepatitis B surface antigen (e.g., Recomblvax HB), Borrelia burgdorferi outer sourface protein A (LYMErix), + human papillomavirus major capsid proteins (Gardasil)
Enzymes Glucocerebrosidase (Cerezyme), DNase (Pulmozyme), thrombolytics (e.g., alteplase [Activase]), urate oxidase (rasburicase, Elitek)
Ovel synthetic proteins Fusion protein of interleukin-2 and diphtheria toxin (denileukin diftitox [Ontak]), soluble TNF receptor linked to IgG Fc (etanercept [Enbrel])
Novel conjugates Pegylated proteins: interferon (peginterferon alfa-2a [Pegasys]), granulocyte colony-stimulating factor (pegfilgrastim [Neulasta]), human growth hormone (pegvisomant [Sornavert])
  Covalently attached metal chelators: ibrutumomab tiuxetan (Zevalin)
  Covalently attached radioactive iodine: Iodine-131 tositumomab (Bexxar)
  Covalently attached chemotherapeutics: gemtuzumab ozogarnicin (Mylotarg)