The C Antigen is a type of protein found on the surface of certain cells, particularly in the immune system. It plays a crucial role in the body's ability to recognize and respond to foreign substances, such as bacteria and viruses. The presence of C Antigen can help in identifying specific cell types and understanding immune responses. In medical research, C Antigen is often studied for its implications in diseases, including cancer and autoimmune disorders. By analyzing the expression of C Antigen, scientists can gain insights into disease mechanisms and develop targeted therapies to improve patient outcomes.