单项选择题
If a person had a mutation in the gene encoding J (joining) chains, which of the following classes of antibodies could NOT be produced? ()
A.IgA and IgM
B.IgA and IgG
C.IgG and IgE
D.IgD and IgE
E.IgG and IgM
If a person had a mutation in the gene encoding J (joining) chains, which of the following classes of antibodies could NOT be produced? ()
A.IgA and IgM
B.IgA and IgG
C.IgG and IgE
D.IgD and IgE
E.IgG and IgM