which structure help in providing antigen specificity ??in celll

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Please refer the solution below for the said query


The presence of membrane-bound immunoglobulin on the B-cell surface provides antigen specificity to these cells. 


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Membrane-bound immunoglobulin on the B-cell surface serves as the cell's receptor for antigen, and is known as the B-cell receptor (BCR). Immunoglobulin of the same antigen specificity is secreted as antibody by terminally differentiated B cells—the plasma cells.
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