antibodies

• Antibody definition 


  A protein found in the blood that is produced by plasma cells which binds to antigens as a part of the immune response.
• Antibody structure


  • Antibodies have four polypeptide chains - two heavy chains and two light chains (held together by disulfide bridges)
  • Variable region is where the antigen binding site is located (different in different antibodies)
  • Constant region is the same in all antibodies