11. Where is the IgA found, how many subclasses does it have? What are its two forms? Describe serum and secretory IgA
11. In seromucous secretions: saliva, milk, colostrum, gut, tracheobronchial system, genito-urinary sysyem. 2, monomeric and dimeric. Serum- monomeric: IgA1 90% IgA2 10%. Secretory- dimeric. IgA1 40%, IgA2 60% +sc
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