B Cell Membrane Proteins Fc receptor FcyRII(CD32) Virtually all B cell express a low affinity receptor for the Fc portion of IgG Involved in "Ab feedback"to inactivate B cells to inhibit Ab production FCyRI(CD64)-restricted distributionB Cell Membrane Proteins ◼ Fc receptor FcgRII (CD32) ◼ Virtually all B cell express a low affinity receptor for the Fc portion of IgG ◼ Involved in “Ab feedback” to inactivate B cells to inhibit Ab production ◼ FcgRI (CD64) – restricted distribution