Recombinant protein is a protein coded by the manipulated gene – Recombinant Gene and generated by the specific recombinant expression system (see protein expression systems). The recombinant gene is a new genetic combination that one or more DNA segments or genes have been inserted from a different molecule or from from other species. Compared with natural protein, recombinant protein can be produced in large amounts with relative ease.

Recombinant protein plays an important role in studying biological processes such as Cytokines and Growth Factors, enzymes and kinases researches and complement system functions. Moreover, recombinant proteins are known as highly potent medicines that are safe from off-target side effects, take a shorter time to develop than small molecules.