每个淋巴球在表面都有受体分子，可结合成一种特殊的抗原。
Each has receptor molecules on its surface that Bind to a specific antigen.
四聚物的结合是通过表面免疫球蛋白抗原受体，通过Fc受体结合抗体的很少量甚至没有。
Binding of the tetramers occurred by the surface immunoglobulin antigen receptor with little or no binding to antibody captured in the Fc receptor.
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