The first classification is according to blood factors, more precisely factor VIII and factor IX. In addition, secondly thromboliytic agents (like tissue plasminogen activator) and hromones (like insulin, growth hormone, gonadotrophins) also are part of the biopharmaceutical classification system. Moving on, haemotopoietic growth factors (like erythropoietin, colony stimulating factors) are also an important category. Of course also different interferons (like -α, -β, -γ) and interleukin based products as well as vaccines are listed as biopharmaceutical classification systems. Various monoclonal antibodies and additional products (like tumor necrosis factor and therapeutic enzymes) are listed as part of biopharmaceutical classification system.