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FCGR2B2) and they are created by mRNA splicing mechanism, which results in the inclusion (FCGR2B1) or exclusion (FCGR2B2) of the C1 exon sequence. The presence of the C1 exon sequence (in FCGR2B1) results in tethering to the membrane of B cells, whereas its absence (in FCGR2B2) allows fast internalization of the receptor in myeloid cells. Both forms contain the Immunoreceptor Tyrosine-based Inhibitory Motif (ITIM)

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