SUPPRESSION OF “IN VITRO” ANTIBODY SYNTHESIS BY A T CELL PRODUCT. ITS RELATION WITH THE Fc RECEPTOR OF ACTIVATED T CELLS11This work was supported by grants from INSERM and CNRS.,22Abbreviations used in this paper: ATC: activated T cells, DNP-AE-DEXTRAN: dinitrophenylated-aminoethyl-dextran, EAIgG: sheep erythrocytes sensitized with rabbit anti-Forssman IgG, IBF: Immunoglobulin Binding Factor, PFC: Plaque forming cells, SRBC: sheep red blood cells, TRF: T cell replacing factor.