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Microbiology
Human immunoglobulin A can be described by which of the following statements?
It is the predominant immunoglobulin in plasma
It exists in four subclasses, of which IgA 2 is predominant
It can prevent attachment of microorganisms to epithelial cell membranes
It is prominent early in the immune response and is the major class of antibody in cold agglutinins
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