The IgG Fc contains distinct Fc receptor (FcR) binding sites: the leukocyte receptors Fc gamma RI and Fc gamma RIIa bind to a region in the Fc distinct from that recognized by neonatal FcR and protein A.
Wines BD, Powell MS, Parren PW, Barnes N, Hogarth PM
Biochemical analysis and crystallisation of Fc gamma RIIa, the low affinity receptor for IgG.