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.

rg122074 Asked question June 3, 2021