Multiple choice

Which immunoglobulin class is only found in mammals?

  1. IgA

  2. IgG

  3. IgM

  4. IgD

  5. IgE

Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Immunoglobulin E is a class of antibody (or immunoglobulin (Ig) isotype) that has been found only in mammals. IgE is the least abundant isotype of all antibodies but it is capable of triggering the most powerful immune reactions.