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Name the class of immunoglobulin which has a pentameric structure?

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Name the class of immunoglobulin which has a pentameric structure?

(a) IgE

(b) IgG

(c) IgA

(d) IgM

This question was posed to me in an interview.

My doubt is from Immunoglobulins topic in portion Immunology of Life Sciences

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Correct option is (d) IgM

Best explanation: IgM is the first antibody to produce during the primary response to antigen and it is also the first antibody which is made by the developing B-cells. It is composed of five units and formed pentameric structure with a J-chain.

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