Development of human granulocyte and monocyte Fc receptors.

Bone marrow cells were examined for the presence of IgG-Fc receptors using a red cell rosette technique. Receptors were demonstrated on some of the neutrophil promyelocytes, almost all of the neutrophil myelocytes, and a few of the eosinophil myelocytes. Cells which appeared on morphological grounds to be promonocytes also expressed Fc receptors.