Which of the following statements is true regarding the complement component C4B?
a. Deficiency of C4B is associated with systemic lupus erythematosus (SLE).
b. C4B has similar properties to those of C4A.
c. The thioester bond of C4B is preferentially acted upon by amino groups of macromolecules.
d. C4B is encoded in the class II region of the MHC.
e. The gene for C4B is duplicated or deleted in some individuals.
e
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