IgA Immunoglobulin
•eIgA
•UTwo forms:
•Lsecretory IgA
•Lmonomeric IgA
•-found in secretory fluids
•-dimeric form (2 basic units held by a J chain)
•-secretory piece protects Ig from degradation by proteolytic enzymes
•-found in serum
•-both forms (monomeric & dimeric) are found in serum
•Uaccounts for 15% of total immunoglobulins