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Define the term Secondary IgA

Define the term Secondary IgA?

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This is a dimmer of molecular weight of 400,000 Daltons and sedimentation coefficient of 11S.

It includes a glycin rich polypeptide termed as secretary piece or secretary component. This is relatively resistant to the digestive enzymes and dropping enzymes. It is thought to play a significant role in local immunity against intestinal and respiratory pathogens.   

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