The difference between an antibody allotype and isotype is:
a. isotype is the difference in constant regions; allotype are differences within isotypes
b. allotype is the difference in constant regions; isotype are differences within allotypes
c. isotype is the difference in constant regions; allotype are alternations in the hypervariable regions
d. isotype are alternations in the hypervariable regions; allotypes are differences within isotypes
e. isotype are alternations in the hypervariable regions of one person; allotypes are alternations in the hypervariable regions among a species
Answer: a. isotype is the difference in constant regions; allotype are differences within isotypes
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