Proteins are composed of one or more long chains composed of α -amino acid residues. It is an important component of all the cells and tissues of the human body. Protein is an important part of the body tissues and organs. It can not only provide the necessary nutrition and energy for the human body, but also regulate the physiological function of the human body.
Proteins can be divided into natural proteins and recombinant proteins according to their source; they can also be divided into bacterial proteins, viral proteins, growth factors, cytokines, biomarkers, enzymes and other species.
