A Southern Research peptide is defined as any peptide developed by the Southern Research Institute. A peptide is a chemical compound constructed of two different amino acids, according to class notes from Michigan State University.
In most contexts, a Southern Research peptide would refer to a therapeutic peptide meant for assisting immunity response in the body. According to its official website, the Southern Research Institute has been in operation since 1941 and is a not-for-profit organization specializing in pharmacological research. Its website lists the company's areas of expertise as cancer, infectious diseases, neurological diseases and vaccine development. It is also affiliated with the University of Alabama at Birmingham. As of 2014, this organization holds an A+ rating with the Better Business Bureau with no registered complaints.