Discussion
The major immunoglobulin family to which a particular immunoglobulin belongs can be determined by sequential analysis of the 110 amino acids beginning from the
Answer: D
Correct answer: Carboxy terminus of the heavy chain
The class is defined by the constant region of the heavy chain, and the constant region lies at the carboxy end. Sequencing from the amino terminus would give the variable domain, which differs between antibodies of the same class and is therefore no guide to it. The light chain carries no class information at all.
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