Definition: Antibody is plasma protein produced in response to an Ag with which it reacts specifically.

Classification: On the basis of amino acid sequence in the constant of heavy chain the Ig are divided in to 5 classes:

  • Ig G
  • Ig A
  • Ig M
  • Ig E
  • Ig D

Antibody type


  • Neutralize toxins & virus.
  • Activate complement.
  • Prevent attachment of microbes to mucosal surface.
  • Opsonization

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