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B Cell Receptor Complement Complex Transmembrane Signaling Surface Composed

Front A transmembrane signaling receptor on the B-cell surface composed of the proteins CD19, CD81, and CD21 complement receptor 2, which binds complement fragments on bacterial antigens also bound by the B-cell receptor. Co-ligation of this complex with the B-cell receptor increases responsiveness to antigen about 100-fold
Back B-cell co-receptor complex

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