>95% by SDS-PAGE
Fc is a crystallizable fragment composed of the carboxyl terminal of two kinds of immunoglobulin heavy chain, which is connected to each other by disulfide bond. The Fc fragment contains the carboxyl terminal part of the heavy chain fixation region, which is responsible for the effect function of immunoglobulin (complement fixation, binding to the cell membrane through Fc receptors, and placental transport). It is reported that IgG1 Fc, as a potential anti-inflammatory drug, plays a new role in the treatment of human autoimmune diseases.