Receptors for the Fc region of IgG (Fc + RIIIa, Fc + RIIc) and IgM (Fc ? R) were previously described on NK cells. In this work the expression of Fc receptors for IgA (Fc § R) on human NK cells and the signaling events were investigated. The Fc § R was demonstrated by flow cytometry using secretory IgA (sIgA) and anti-human IgA antibody.
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