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evan888 evan888
wrote...
10 years ago
A.   γ
B.   κ
C.   δ
D.   μ
E.   None of the above

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wrote...
Staff Member
2 months ago
The first immunoglobulin (Ig) isotype produced during the primary immune response is IgM, which has the μ (mu) heavy chain. So, the correct answer is:

D. μ
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