Antibodies are differentiated based on their heavy chains; different heavy chains create different isotypes. Humans have five different isotypes of immunoglobulins.

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Antibodies are differentiated based on their heavy chains; different heavy chains create different isotypes. Humans have five different isotypes of immunoglobulins.

Immunology

The part of the molecule responsible for differences among immunoglobulin classes is:
A . Fc
B. Fab
C. heavy chains
D. light chains
E. Hinge regions

Answer: C