Alpha Diagnostic International (ADI) located in San Antonio, Texas, USA, is a major provider of custom services such as peptides synthesis and polyclonal antibodies. ADI specializes in the development, manufacture, and distribution of variety of ELISA reagents and kits for animal and human research. ADI maintains an USDA inspected and approved, animal facility. They have introduced a number of specialized antibodies to a variety of new genes including obese/leptin, membrane receptors, and neurotransmitter transporters.