The results of studies of the accessory functions of various heterologous cells in gamma interferon production by human blood and lymph T-lymphocytes are presented. It was shown that, in addition to autologous and allogeneic monocytes, the role of accessory cells may be played to some extent by xenogeneic (mouse) monocytes as well as human continuous cells of different origin. The degree of the accessory function was different in interaction of the accessory cells with T-lymphocytes from blood and lymph.
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