Flow cytometric analysis of FcγRIIc1 and IIc3 expression in stable transfections. K562 cell line or Jurkat cells transfected with full-length cDNAs encoding FcγRIIb1, FcγRIIc1, and FcγRIIc3 were analyzed by indirect immunofluorescence staining with four anti-CD32 MoAbs (filled histograms) or with a mouse IgG isotype control (dotted line), followed by staining with FITC-GAMIgG.