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Which of the following is not true of marginal zone B cells? a. They respond quickly...

Which of the following is not true of marginal zone B cells?

a. They respond quickly to blood-borne antigens

b. they express high levels of CD21

c. They are considered B-2 cells

d. They respond to capsular polysaccharides

e. They are found in the spleen

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Marginal zone B Cells

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