“…One of the most controversial definitions refers to biopharmaceuticals, but as Walsh clearly elucidated, a biopharmaceutical should be defined as ‘a protein or nucleic acid based pharmaceutical substance used for therapeutic or in vivo diagnostic purposes, which is produced by means other than direct extraction from a native (non‐engineered) biological source’ . Thus, biopharmaceuticals include recombinant proteins (enzymes, hormones, interleukins, interferons, growth factors and blood factors), recombinant and engineered synthetic peptides, monoclonal antibodies (mAbs), cell and tissue therapies, genetic therapies (genes and antisense and inhibitory RNA fragments), recombinant and molecularly engineered vaccines and other expressing recombinant molecules (for example, polymers, liposomes, fusion protein and mAb fragments and derivatives) . As can be seen, biopharmaceuticals include a diversity of biomolecules, and therefore, the production of these compounds can involve a wide range of methods, ranging from microorganisms to transgenic animals, used as heterologous expression systems.…”