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Antibodies
A. Are protein molecules.
B. Are absent from the blood in early fetal life.
C. Are produced at a greater rate after a first, than after a second, exposure to an antigen six weeks later.
D. Circulating as free immunoglobulins are produced by B lymphocytes.
E. With a 1 in 8 titre are more concentrated than ones with a 1 in 4 titre.

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