Explaining the Role of IgD Antibody on Lymphocytes

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IgD antibodies are primarily located on the plasma membrane of lymphocytes and function as antigen receptors. B lymphocytes undergo several developmental stages, culminating in mature B lymphocytes that express IgD on their surface. These mature B cells can then differentiate into plasma cells, which are the final stage of B cell development and responsible for producing antibodies. The relationship between IgD and the antibody production process can be confusing, but it is essential to understand that IgD serves as a receptor on mature B cells, while plasma cells are the ones that secrete antibodies.
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"It's found mainly on the plasma membrane of lymphocytes and probably act as antigen receptors."

that is what is written in my textbook on IgD antibody.

I just read the basic concept of antibody. According to what I've read, the B lymphocytes produce plasma cell which ultimately gives rise to antibodies. This concept when applied in case of IgD doesn't really make much sense to me.

Please explain.
 
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B-lymphocytes go through many developmental stages. At the final stage you have mature B-lymphocytes that express IgD on their surface. Plasma cells are mature, terminally differentiated B-lymphocytes.
 
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